Nie mam gdzie usiąść w kuchni, bo akurat malujemy ściany.

This is a very natural Polish pattern.

Nie mam gdzie + infinitive means I don’t have anywhere to... or I have nowhere to....
So:

• Nie mam gdzie usiąść = I have nowhere to sit down
• literally: I don’t have where to sit down

Polish often uses mieć (to have) in this kind of expression:

• Nie mam co jeść = I have nothing to eat
• Nie mam z kim rozmawiać = I have nobody to talk to
• Nie mam dokąd iść = I have nowhere to go

This sounds completely normal in Polish, even though English uses a different structure.

Because usiąść means to sit down or to take a seat, while siedzieć means to be sitting.

In this sentence, the speaker means there is no place available to sit down, not that they are unable to remain in a sitting position.

Compare:

• usiąść = to sit down, to take a seat
• siedzieć = to sit, to be sitting

So:

• Nie mam gdzie usiąść = I have nowhere to sit down
• Nie mam gdzie siedzieć could also be possible in some contexts, but it would suggest I have nowhere to sit/stay seated, which is a bit different in nuance.

After words like gdzie, co, z kim, dokąd, Polish often uses an infinitive to express what/where/with whom to do something.

So:

• gdzie usiąść = where to sit down
• co zrobić = what to do
• z kim porozmawiać = someone to talk to
• dokąd pójść = somewhere to go

This is a standard structure in Polish. English often uses to + verb in a similar way:

• where to sit
• what to do
• who to talk to

These are different aspects of the same basic action.

• usiąść = perfective: to sit down as a completed action
• siadać = imperfective: to be sitting down / to sit down repeatedly / habitually

In this sentence, usiąść is used because the idea is a single completed action: find a place and sit down.

Examples:

• Chcę usiąść. = I want to sit down.
• Zwykle siadam przy oknie. = I usually sit down by the window.

Using usiąść here is the most natural choice.

Because Polish usually drops subject pronouns when the verb already makes the subject clear.

• Nie mam already tells us the subject is I
• malujemy already tells us the subject is we

So:

• Nie mam = I don’t have
• malujemy = we are painting

Adding ja or my is possible, but usually only for emphasis or contrast:

• Ja nie mam gdzie usiąść, ale ty masz. = I have nowhere to sit, but you do.

Here akurat means something like:

• just now
• at the moment
• right now
• as it happens

In this sentence, it adds the idea that the painting is happening right at this particular time, which is why there is nowhere to sit.

So:

• bo akurat malujemy ściany = because we’re painting the walls right now

Be aware that akurat can have other shades of meaning in other contexts, including ironic ones, but here it simply means at the moment / just now.

Because malować takes a direct object in the accusative case when you paint something.

• malować ściany = to paint the walls

Here ściany is the accusative plural form of ściany. For this noun, nominative plural and accusative plural look the same.

Compare:

• Maluję pokój. = I’m painting the room.
• Malujemy ściany. = We’re painting the walls.

Other expressions mean different things:

• malować ścianami would be ungrammatical in this meaning
• malować na ścianach means to paint on the walls, as in making pictures or writing on them

So malować ściany is the correct form for repainting walls.

Polish does not need a separate verb like English to be to make the present continuous.

In Polish, the simple present tense often covers both:

• we paint
• we are painting

So:

• malujemy can mean we paint or we are painting

The context, especially akurat, makes it clear that this means we are painting right now.

Because the sentence describes an action that is currently in progress.

• malować = imperfective, ongoing/repeated process
• pomalować = perfective, complete the painting

Since the walls are being painted right now, Polish uses the imperfective:

• akurat malujemy ściany = we’re painting the walls right now

If you said pomalujemy, that would usually mean we will paint or we’ll get the walls painted / paint them completely, not that the action is happening at this moment.

Here w kuchni means in the kitchen.

After w, Polish can mean either location or motion depending on the case:

• w + locative = in, inside, at a location
• w + accusative = into, to the inside of something

Here kuchni is the locative form of kuchnia, so it means location:

• w kuchni = in the kitchen

Compare:

• Jestem w kuchni. = I am in the kitchen.
• Idę w stronę kuchni. = I’m going toward the kitchen.
  (Polish usually does not say idę w kuchnię in normal standard usage for this idea.)

So in this sentence, it clearly means in the kitchen.

Both can mean because, but they differ in tone.

• bo = common, everyday, conversational
• ponieważ = more formal or neutral in writing

In a natural spoken sentence like this, bo is the normal choice:

• Nie mam gdzie usiąść w kuchni, bo akurat malujemy ściany.

If you replaced it with ponieważ, the meaning would stay the same, but it would sound a bit more formal:

• Nie mam gdzie usiąść w kuchni, ponieważ akurat malujemy ściany.

Yes. Polish word order is flexible, though different orders can change emphasis.

The given sentence is very natural:

• Nie mam gdzie usiąść w kuchni, bo akurat malujemy ściany.

But you could also say:

• W kuchni nie mam gdzie usiąść, bo akurat malujemy ściany.

That version puts more focus on in the kitchen.

You could also hear:

• Bo akurat malujemy ściany, nie mam gdzie usiąść w kuchni.

This is less neutral and puts early emphasis on the reason.

So the original version is a good default, but other word orders are possible.

It comes from the same word as the question word where, but here it is not asking a direct question. It functions inside a larger expression:

• gdzie usiąść = where to sit / somewhere to sit

So in this sentence, gdzie introduces an indirect-type phrase rather than a direct question.

Compare:

• Gdzie usiąść? = Where should I sit?
• Nie mam gdzie usiąść. = I have nowhere to sit.

English works similarly:

• Where should I sit?
• I don’t know where to sit.
• I have nowhere to sit.

Yes, but it means something slightly different.

• Nie mam gdzie usiąść w kuchni = I have nowhere to sit in the kitchen
• Nie ma gdzie usiąść w kuchni = There’s nowhere to sit in the kitchen

The first version is centered on my situation.
The second version is a more general statement about the kitchen.

In many real situations, the meanings are close, but the grammar and perspective are different.

Usiąść is a perfective verb meaning to sit down. It can look strange because of the nasal vowel and consonant changes.

A rough pronunciation guide:

• u-syąść is a helpful approximation for English speakers
• the ą is a nasal vowel, not exactly like any simple English vowel
• ść is a soft consonant cluster, something like a very soft shtch / shch, though that is only approximate

It feels irregular because Polish verbs of motion/change of position often have stems that change:

• siadać = to sit down repeatedly / imperfective
• usiąść = to sit down / perfective

So the pair is not as neat as some English learners expect, but it is a very common verb pattern in Polish.