Θέλω να βάψω και το μικρό τραπέζι αύριο, αλλά δεν μου αρέσει να βάφω όταν το σπίτι είναι γεμάτο κόσμο.

Greek often leaves out subject pronouns because the verb ending already shows the person.

• Θέλω = I want
• μου αρέσει = it is pleasing to me / I like

So εγώ (I) is not necessary unless the speaker wants extra emphasis or contrast.

For example:

• Θέλω να βάψω... = I want to paint...
• Εγώ θέλω να βάψω... = I want to paint... (with emphasis, like I do)

Modern Greek does not normally use an infinitive the way English does. Instead, it uses να + verb.

So:

• θέλω να βάψω = I want to paint
• μου αρέσει να βάφω = I like painting / I like to paint

You can think of να as introducing a subordinate verb clause where English would often use to + verb or an -ing form.

This is one of the most important Greek verb differences: aspect.

• βάψω = perfective: one complete action, seen as a whole
• βάφω = imperfective: ongoing, repeated, or habitual action

So here:

• Θέλω να βάψω... αύριο
  means the speaker wants to do one complete painting action tomorrow.

• δεν μου αρέσει να βάφω...
  means the speaker does not like the activity of painting in general, especially in that situation.

In English, both may be translated with paint, but Greek makes the difference clearer.

Because after θέλω, Greek normally uses να, not θα.

So:

• Θέλω να βάψω... = I want to paint...
• not Θέλω θα βάψω...

The future meaning comes from:

• the main verb θέλω (I want), and
• the time word αύριο (tomorrow)

θα is used for a future statement in a main clause, for example:

• Θα βάψω το τραπέζι αύριο. = I will paint the table tomorrow.

But after θέλω, you use να.

Here και means also / too.

In this sentence:

• Θέλω να βάψω και το μικρό τραπέζι αύριο

the και goes with το μικρό τραπέζι, so the meaning is:

• I want to paint the small table too tomorrow

It suggests that something else is being painted as well, and the small table is an additional item.

If και were placed differently, the emphasis could change.

This is the normal Greek pattern:

• article + adjective + noun

So:

• το = the
• μικρό = small
• τραπέζι = table

Together: το μικρό τραπέζι = the small table

A few useful points:

• τραπέζι is neuter singular
• the adjective μικρό matches it in gender, number, and case
• the article is also neuter singular: το

In this sentence it is the direct object of βάψω, but for a neuter singular noun like τραπέζι, the accusative looks the same as the nominative, so you still see το μικρό τραπέζι.

Because Greek expresses this idea differently from English.

Literally, μου αρέσει is something like:

• it is pleasing to me

So:

• μου = to me
• αρέσει = pleases / is pleasing

That is why Greek uses μου instead of a subject pronoun like I.

In this sentence:

• δεν μου αρέσει να βάφω...
  = I don’t like painting...

Also notice that αρέσει is singular, because the thing that is pleasing or not pleasing is the whole action να βάφω.

Compare:

• Μου αρέσει να διαβάζω. = I like reading.
• Μου αρέσουν τα βιβλία. = I like books.

In the second example, αρέσουν is plural because τα βιβλία is plural.

όταν means when.

Here it introduces a time clause:

• όταν το σπίτι είναι γεμάτο κόσμο
• when the house is full of people

The present tense είναι is used because this describes a general or repeated situation:

• I don’t like painting when the house is full of people
• in other words, whenever the house is full of people

So the speaker is not talking about just one specific moment, but about a general circumstance.

Because γεμάτο κόσμο is a very natural Greek way to say full of people.

Here κόσμο is used in a general, indefinite sense:

• not full of the people
• but full of people

Greek often uses a bare noun like this after γεμάτος / γεμάτη / γεμάτο when talking about what something is filled with.

Examples:

• Το σπίτι είναι γεμάτο κόσμο. = The house is full of people.
• Το ποτήρι είναι γεμάτο νερό. = The glass is full of water.

You may also hear:

• γεμάτο από κόσμο

which means essentially the same thing.

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

This sentence says:

• Θέλω να βάψω και το μικρό τραπέζι αύριο...

But you could also hear:

• Θέλω αύριο να βάψω και το μικρό τραπέζι...
• Αύριο θέλω να βάψω και το μικρό τραπέζι...

These versions are all possible. The difference is mostly about emphasis and flow, not basic meaning.

In the original sentence, αύριο comes after το μικρό τραπέζι, which sounds natural and keeps the focus on also the small table before mentioning tomorrow.