Давайте не сидеть порознь: в этом кафе есть большой стол у окна.

Давайте is a very common way to make a suggestion in Russian, similar to let’s in English.

So:

• давайте сидеть вместе = let’s sit together
• давайте не сидеть порознь = let’s not sit separately

This pattern is:

• давайте + infinitive

It is neutral and very common in spoken Russian.

You may also see:

• давай with one person, in informal speech
• давайте with more than one person, or when being polite

So in this sentence, давайте sounds like a friendly suggestion to the group.

After давайте, Russian usually uses the infinitive, not the imperative.

So the structure is:

• давайте читать = let’s read
• давайте подождать = let’s wait
• давайте не сидеть порознь = let’s not sit separately

Russian does have imperative forms, but with давайте, the infinitive is the standard construction.

Compare:

• Сядем вместе. = Let’s sit together.
• Давайте сядем вместе. = Let’s sit together.
• Давайте сидеть вместе. = Let’s sit together / let’s be sitting together.

The version in your sentence uses сидеть, which focuses on the state or activity of sitting, rather than the single action of sitting down.

Порознь means separately, apart, or not together.

So:

• сидеть порознь = to sit separately / apart from each other

It is an adverb.

Some close ideas are:

• отдельно = separately
• врозь = apart

But порознь often has a slightly human or group-related feeling: people are not together, but spread out or separated from each other.

So не сидеть порознь naturally suggests: let’s not split up and sit apart.

The colon introduces the reason or explanation for the suggestion.

So the sentence works like:

• Let’s not sit separately: there’s a big table by the window in this café.

The second part explains why sitting together is possible or a good idea.

In English, you might also use:

• a colon
• a dash
• or even because

Russian punctuation often uses a colon in this kind of explanatory relationship between two clauses.

В этом кафе means in this café.

Here:

• в = in
• этом = this
• кафе = café

This is the prepositional case, used after в when talking about location.

So:

• в кафе = in the café
• в этом кафе = in this café

The form этом is the prepositional singular form of этот.

A useful pattern:

• в этом доме = in this house
• в этом магазине = in this store
• в этом кафе = in this café

Good question. Кафе is one of those Russian nouns that is usually indeclinable, meaning its form does not change across cases.

So you get:

• это кафе = this café
• в кафе = in the café
• из кафе = from the café

The case is still there grammatically, but the noun itself keeps the same form.

This is common with many borrowed words in Russian, especially some ending in -е, -и, -о, or -у.

Here есть means there is / there are.

So:

• в этом кафе есть большой стол = there is a big table in this café

This is not the same as есть meaning to eat. Context tells you which meaning is intended.

In Russian, есть is often used to express existence or availability:

• У меня есть книга. = I have a book.
• Здесь есть магазин. = There is a store here.
• В этом кафе есть большой стол. = There is a big table in this café.

It is included because the speaker is pointing out that such a table exists and is available as a reason to sit together.

Russian can sometimes omit есть, especially in informal speech or when simply describing something. But with есть, the sentence clearly emphasizes existence:

• В этом кафе есть большой стол у окна. = There is a big table by the window in this café.

Without есть, it would sound more like a descriptive statement, and in many contexts it may feel less natural for introducing something newly available.

So here есть is very natural because the speaker is saying, in effect: There’s a big table available, so let’s sit together.

Большой стол means a big table.

Both words are in the nominative singular because they are the subject-like noun phrase after есть in an existence sentence.

• большой = big
• стол = table

Since стол is masculine singular, the adjective also takes the masculine singular nominative form:

• большой стол
• not большая стол
• not большое стол

So this is a standard adjective + noun agreement pattern.

У окна means by the window or near the window.

The preposition у usually takes the genitive case.

So:

• окно = window
• окна = genitive singular of окно

That gives:

• у окна = by the window

Very common examples:

• у дома = by the house
• у двери = by the door
• у моря = by the sea

In this sentence, стол у окна means a table by the window.

Sometimes English may translate у окна as at the window, but the core meaning is by / near the window.

With furniture, стол у окна most naturally means: a table positioned by the window.

So in this sentence, by the window is usually the best translation.

Russian word order is flexible, but this order is natural because it introduces the setting first and then tells you what exists there.

Structure:

• в этом кафе = in this café
• есть = there is
• большой стол у окна = a big table by the window

This is very similar to English information flow: In this café, there is a big table by the window.

Other word orders are possible, but they would change the emphasis. For example:

• У окна есть большой стол would sound odd in most contexts.
• Большой стол у окна есть в этом кафе is possible, but more marked and contrastive.

The given order is the most neutral and natural.

Yes. Сидеть is imperfective, and that makes sense because it describes an ongoing state or activity: to be sitting.

So:

• сидеть порознь = to sit separately / to be sitting apart

If the speaker wanted to focus on the action of taking seats, Russian might use a perfective verb such as сесть:

• Давайте не сядем порознь is much less natural in this context
• Давайте не будем садиться порознь could work in some contexts
• Давайте сядем за большой стол = let’s sit down at the big table

In your sentence, сидеть fits because the speaker is talking about the arrangement of where people should be seated, not only the moment of sitting down.

Yes, the sentence is natural, though a native speaker might also say it in a few slightly different ways depending on style.

For example:

• Давайте не будем сидеть порознь: в этом кафе есть большой стол у окна.
• Давайте сядем вместе: у окна есть большой стол.
• Давайте не будем рассаживаться порознь.

Your original sentence is perfectly understandable and natural. It sounds like someone noticing a good seating option and suggesting that the group stay together.