Jag gillar sådana kvällar när vi bara sitter hemma och pratar.

Both are correct.

• sådana is the full, standard written form.
• såna is a common spoken and informal written form.

They both mean such evenings or evenings like that.

In this sentence, sådana kvällar sounds a bit more neutral and standard.

Because it agrees with a plural noun.

• en sådan kväll = such an evening
• sådana kvällar = such evenings

Here, kvällar is plural, so sådan becomes sådana.

Because the sentence is talking about evenings in general, not a specific set of evenings.

• kvällar = evenings / evenings like that
• kvällarna = the evenings

So:

• Jag gillar sådana kvällar = I like evenings like that
• Jag gillar sådana kvällarna would be incorrect here

If you wanted to talk about specific evenings already known from context, you would structure it differently.

Here, när means when.

The phrase sådana kvällar när... literally means such evenings when..., but in natural English it often becomes evenings like that where... or simply the kind of evenings when...

So Swedish uses när because it is referring to the time/situation in which something happens.

Swedish often does not need an extra relative word like English does.

In English, you might say:

• I like those evenings when we just sit at home and talk

In Swedish, när is enough to connect the idea. You do not need a separate word for that.

Because bara usually comes before the part it modifies.

Here, bara means just/simply, and it modifies the whole activity:

• vi bara sitter hemma och pratar = we just sit at home and talk

Putting bara before sitter is the most natural position here.

If you moved it, the emphasis could change or the sentence could sound less natural.

Yes, literally it means sit at home, but in Swedish this is a very natural way to express be sitting at home, stay home, or hang out at home.

So vi sitter hemma och pratar suggests a relaxed situation:

• we are at home
• we are sitting around
• we are talking

It is more vivid than just saying vi är hemma (we are at home).

Because och connects two verbs with the same subject, and you do not use att there.

• vi sitter hemma och pratar = we sit at home and talk

This works like English:

• we sit at home and talk not
• we sit at home and to talk

So sitter and pratar are simply two coordinated verbs.

Because Swedish often uses the present tense for things that are generally true, habitual, or typical.

This sentence is not necessarily about one specific evening happening right now. It describes the kind of evening the speaker likes.

So:

• vi bara sitter hemma och pratar = we just sit at home and talk

This is similar to English, where the present can also describe a typical situation.

Yes, absolutely.

Both mean I like such evenings / I like evenings like that.

A rough difference:

• gillar is very common and straightforward
• tycker om can sound slightly softer or more personal in some contexts

In this sentence, both are natural:

• Jag gillar sådana kvällar...
• Jag tycker om sådana kvällar...

Because once the subject is clear, Swedish does not need to repeat it.

• vi sitter hemma och pratar literally: we sit at home and talk

The subject vi applies to both verbs:

• vi sitter
• (vi) pratar

This is the same as English:

• we sit at home and talk not usually
• we sit at home and we talk

It is neutral and very natural everyday Swedish.

Nothing in it is especially formal. The only slightly more formal-looking part is sådana, because in speech many people would say såna.

So:

• Jag gillar sådana kvällar när vi bara sitter hemma och pratar. = neutral standard Swedish
• Jag gillar såna kvällar när vi bara sitter hemma och pratar. = a bit more informal/spoken

Not naturally in most English translations.

Here bara usually means just or simply:

• vi bara sitter hemma och pratar = we just sit at home and talk

If you translated it as only, the English might sound too literal or slightly awkward:

• we only sit at home and talk

That can suggest contrast, as if you are saying you do nothing else. Swedish bara here is softer and more natural, closer to just.