Stara tapeta nie wygląda już dobrze, więc jutro ją zdejmiemy.

Because tapeta is a feminine singular noun in Polish, and adjectives must agree with the noun in gender, number, and case.

• tapeta = feminine singular
• so old wallpaper = stara tapeta

Compare:

• stary dom = an old house
• stara tapeta = old wallpaper
• stare krzesło = an old chair

Here both words are in the nominative singular, because stara tapeta is the subject of the sentence.

Its basic meaning is old, but in this sentence it naturally suggests that the wallpaper is aged, worn, or no longer in good condition.

Because the next part says nie wygląda już dobrze (doesn’t look good anymore), the full idea is something like:

• The wallpaper is old
• and now it looks bad / shabby / dated

So stara itself means old, but the context adds the sense of past its best.

Because after wyglądać (to look / appear), Polish normally uses an adverb, not an adjective, when describing appearance in a general way.

So:

• wygląda dobrze = looks good
• wygląda źle = looks bad
• wygląda pięknie = looks beautiful

Even though English says looks good, Polish uses dobrze, which is grammatically an adverb.

If you used dobra, that would be an adjective and would need to agree with a noun. So wygląda dobra is not natural here.

Here już means any longer / anymore / no longer, because it appears in a negative sentence:

• nie wygląda już dobrze = doesn’t look good anymore
• literally: doesn’t already look good

In positive sentences, już often means already:

• Już wiem. = I already know.

But with negation, it often shifts to the meaning no longer / anymore:

• Już nie wiem. = I don’t know anymore / I no longer know.

So in your sentence, już is best understood as anymore.

Because in Polish, nie is normally written separately from verbs.

So:

• nie wygląda = does not look
• nie wiem = I don’t know
• nie zrobimy = we won’t do

This is standard Polish spelling.

A useful basic rule:

• nie + verb → usually written separately
• nie + adjective/adverb/participle → often written together, depending on the form

For this sentence, just remember: nie wygląda is completely normal and correct.

Więc means so, therefore, or thus.

In this sentence:

• Stara tapeta nie wygląda już dobrze, więc jutro ją zdejmiemy.
• The old wallpaper doesn’t look good anymore, so we’ll take it down tomorrow.

It introduces a result or consequence:

• it doesn’t look good anymore
• so we’ll remove it tomorrow

The comma is standard in Polish before więc when it connects two clauses like this.

Because jutro is already a complete time adverb meaning tomorrow.

So you simply say:

• jutro = tomorrow
• jutro ją zdejmiemy = we’ll take it down tomorrow

You do not need a preposition such as w here.

Compare:

• dzisiaj = today
• jutro = tomorrow
• wczoraj = yesterday

These often work on their own as adverbs of time.

Ją means her or it, and here it means it, referring back to tapeta.

Why this form?

• tapeta is feminine
• it is the direct object of zdejmiemy (we will remove / take down)
• so Polish uses the accusative singular feminine pronoun: ją

So:

• tapeta → ją
• jutro ją zdejmiemy = tomorrow we’ll remove it

This is a very common pattern:

• Widzę tapetę. = I see the wallpaper.
• Widzę ją. = I see it.

It is future tense.

The verb here is the perfective verb zdjąć, which means to take off / remove / take down. Perfective verbs in Polish do not have a normal present tense meaning. Their present-looking forms actually refer to the future.

So:

• zdejmiemy = we will remove / we’ll take down

This is why the sentence means:

• jutro ją zdejmiemy = tomorrow we’ll remove it

A useful comparison:

• zdejmujemy = we are taking down / we take down
  imperfective, present
• zdejmiemy = we will take down
  perfective, future

So the sentence uses zdejmiemy because it talks about a completed future action.

Because zdejmiemy focuses on the action as a single completed result: the wallpaper will be taken down.

• zdejmiemy = we’ll take it down / remove it
• będziemy zdejmować = we’ll be taking it down

The second version sounds more like the process is being emphasized, while zdejmiemy emphasizes the finished action.

In this context, zdejmiemy is the more natural choice, because the speaker is saying what they plan to do about the wallpaper.

Yes. Polish word order is more flexible than English word order.

The sentence says:

• więc jutro ją zdejmiemy

But you could also hear:

• więc zdejmiemy ją jutro
• więc jutro zdejmiemy ją

These all mean roughly the same thing, but the emphasis changes a little.

The given order is natural because:

• jutro comes early to set the time
• ją smoothly refers back to tapeta
• zdejmiemy comes at the end as the main action

So the original sentence sounds very natural and neutral.