Η φίλη μου δεν συχνάζει σε θορυβώδη μέρη· προτιμά ένα μικρό μαγαζί με ήρεμο σερβιτόρο και καθαρό τραπεζομάντιλο.

In normal Modern Greek, weak possessive pronouns like μου, σου, του usually come after the noun:

• η φίλη μου = my friend
• το σπίτι μας = our house

So μου is not placed before the noun the way my is in English. Other word orders can appear for emphasis or in more literary styles, but η φίλη μου is the standard everyday pattern.

δεν is the normal negation for finite verbs in statements:

• δεν συχνάζει
• δεν θέλω
• δεν πήγε

It comes directly before the verb (or before the verb phrase). Greek uses μη(ν) instead in other environments, such as commands, subjunctive clauses, or expressions like να μην.... In this sentence, it is a straightforward statement, so δεν is correct.

συχνάζει is:

• present tense
• 3rd person singular
• from the verb συχνάζω

So it matches the subject η φίλη μου.

The ending -ει is a very common he/she/it present ending in Modern Greek.

Yes. In Greek, the present tense can describe:

• something happening now
• something habitual or regular

Here, δεν συχνάζει is naturally understood as a habitual action, because the sentence is describing her general preference and behavior, not a single moment in time.

So the Greek present tense works a lot like English doesn't usually go / doesn't hang out in this kind of context.

Because the phrase is talking about noisy places in general, not specific known places.

• σε θορυβώδη μέρη = in noisy places / to noisy places, generally
• στα θορυβώδη μέρη = in the noisy places, meaning specific ones

Also remember:

• σε
  • accusative is the normal pattern
• στα is just σε + τα

So the lack of article makes the phrase more general and indefinite.

The singular is μέρος.

So the pattern is:

• το μέρος = the place
• τα μέρη = the places

This is a neuter noun. In the sentence, μέρη is plural and, after σε, it is in the accusative — but for neuter plural nouns, nominative and accusative look the same.

Because the adjective has to agree with μέρη.

The dictionary form is:

• θορυβώδης for masculine/feminine
• θορυβώδες for neuter singular

With μέρη (neuter plural), the adjective becomes:

• θορυβώδη

So this is an agreement issue: the adjective changes form to match the noun’s gender, number, and case.

That mark is the Greek άνω τελεία.

It works roughly like a strong pause, often similar to an English:

• semicolon
• colon
• strong comma, depending on context

A useful reminder: in Greek, the symbol ; is actually the question mark. So the mark in this sentence is not a question mark.

Both forms can exist in Modern Greek.

For verbs like προτιμώ, the 3rd person singular present may appear as:

• προτιμά
• προτιμάει

The shorter form προτιμά is very common and perfectly standard.
The longer form προτιμάει is also used, often sounding a bit more colloquial or simply like an alternative spoken form.

So in this sentence, προτιμά is completely natural.

Greek does not always need an indefinite article where English uses a/an.

After a preposition like με, Greek often uses a bare noun phrase to describe a feature or characteristic:

• με ήρεμο σερβιτόρο
• με καθαρό τραπεζομάντιλο

This sounds natural when describing what kind of place it is.

You could also say:

• με έναν ήρεμο σερβιτόρο
• με ένα καθαρό τραπεζομάντιλο

That is also grammatical, but it can sound a little more explicit or individualized. The version without the articles is very natural in descriptive writing.

Because Greek adjectives must agree with the nouns they describe in gender, number, and case.

Here is what is happening:

• ένα μικρό μαγαζί
  μαγαζί is neuter singular, so μικρό is neuter singular

• με ήρεμο σερβιτόρο
  σερβιτόρο is masculine singular accusative, so ήρεμο is masculine singular accusative

• και καθαρό τραπεζομάντιλο
  τραπεζομάντιλο is neuter singular accusative, so καθαρό is neuter singular accusative

Also, με takes the accusative, which is why σερβιτόρος becomes σερβιτόρο. Neuter nouns like μαγαζί and τραπεζομάντιλο look the same in nominative and accusative singular, so their form does not visibly change here.