Ο μεσίτης μας είπε ότι το διαμέρισμα είναι ήσυχο και φωτεινό.

Ο μεσίτης means the real-estate agent or the broker.

Greek usually uses the definite article much more regularly than English does. So where English might say The agent told us..., Greek naturally says Ο μεσίτης μας είπε...

• ο = the for a masculine singular noun in the nominative
• μεσίτης = agent / broker / realtor

Because μεσίτης is the subject of the sentence, it appears in the nominative: ο μεσίτης.

μας is the weak object pronoun meaning to us or us, depending on the verb.

In this sentence, λέω/είπα means to tell, so μας είπε means he/she told us.

Greek often prefers this short pronoun form before the verb:

• μας είπε = told us
• literally: to-us said

You could also say είπε σε εμάς, but that is more emphatic, like told us specifically.

So:

• Ο μεσίτης μας είπε... = normal, natural
• Ο μεσίτης είπε σε εμάς... = more marked/emphatic

είπε is the aorist form of λέω and means said / told.

This is the normal Greek past tense for a completed action:

• λέει = he/she says
• είπε = he/she said

So Ο μεσίτης μας είπε... means The agent told us...

Greek uses the aorist here because the act of telling is viewed as a single completed event in the past.

ότι means that and introduces a subordinate clause.

So:

• Ο μεσίτης μας είπε ότι... = The agent told us that...

Everything after ότι is the content of what the agent said:

• το διαμέρισμα είναι ήσυχο και φωτεινό = the apartment is quiet and bright

A useful note: Greek also has ό,τι with a comma-like accent difference, meaning whatever. That is a different word.

• ότι = that
• ό,τι = whatever

This is a very common question for English speakers.

Greek does not always do the same kind of tense backshift that English often does. After a past reporting verb like είπε, Greek can still use the present if the statement is still true or is being presented as a general/current fact.

So:

• Ο μεσίτης μας είπε ότι το διαμέρισμα είναι ήσυχο και φωτεινό.
• literally: The agent told us that the apartment is quiet and bright.

In natural English, this is often translated as:

• The agent told us that the apartment was quiet and bright.

But Greek keeps είναι because it describes the apartment’s qualities, not just what was true at that moment.

το διαμέρισμα means the apartment.

• το = the for a neuter singular noun
• διαμέρισμα = apartment

This phrase is in the nominative because it is the subject of είναι:

• το διαμέρισμα είναι... = the apartment is...

Even though the whole clause comes after ότι, inside that clause το διαμέρισμα is still the subject.

Because they agree with το διαμέρισμα, which is neuter singular.

In Greek, adjectives usually agree with the noun they describe in:

• gender
• number
• case

Here:

• το διαμέρισμα = neuter singular
• ήσυχο = quiet, neuter singular
• φωτεινό = bright, well-lit, neuter singular

So the endings match the noun.

Compare:

• ο μεσίτης είναι ήσυχος = the agent is quiet
• η γειτονιά είναι ήσυχη = the neighborhood is quiet
• το διαμέρισμα είναι ήσυχο = the apartment is quiet

Because these are predicate adjectives, not adjectives directly attached before a noun.

In the sentence:

• το διαμέρισμα είναι ήσυχο και φωτεινό

the adjectives come after είναι and describe the subject. English works the same way:

• the apartment is quiet and bright

You do not need articles before predicate adjectives in Greek.

Compare:

• το ήσυχο διαμέρισμα = the quiet apartment
  here the adjective is directly attached to the noun
• το διαμέρισμα είναι ήσυχο = the apartment is quiet
  here it is a predicate adjective after is

Yes, but the natural meaning in a housing context is slightly broader.

• ήσυχο = quiet, usually meaning not noisy
• φωτεινό = bright, well-lit, often meaning it gets a lot of natural light

When describing an apartment, φωτεινό is a very common positive adjective. It often suggests:

• lots of sunlight
• airy feeling
• pleasant interior light

So in property language, φωτεινό is often closer to bright and sunny than just bright.

Yes. και simply links the two adjectives:

• ήσυχο και φωτεινό = quiet and bright

It works just like English and.

Greek does not need to repeat the verb:

• το διαμέρισμα είναι ήσυχο και φωτεινό not
• το διαμέρισμα είναι ήσυχο και είναι φωτεινό

Though repeating the verb is possible in some contexts, it is unnecessary here.

Yes. Greek word order is more flexible than English, although some orders sound more neutral than others.

The given sentence is very natural and neutral:

• Ο μεσίτης μας είπε ότι το διαμέρισμα είναι ήσυχο και φωτεινό.

But Greek could also say:

• Μας είπε ο μεσίτης ότι το διαμέρισμα είναι ήσυχο και φωτεινό.
• Ο μεσίτης είπε ότι το διαμέρισμα είναι ήσυχο και φωτεινό.
• Ο μεσίτης μάς είπε ότι ήσυχο και φωτεινό είναι το διαμέρισμα.
  this one is much more marked and context-dependent

So yes, the order can change, but the original version is the best basic model to learn.

Not exactly. With λέω/είπα, Greek often has:

• the person told = indirect object-like pronoun
• the message/content = a clause introduced by ότι

So in:

• Ο μεσίτης μας είπε ότι...

μας means to us, and the clause after ότι is what was said.

You can think of it as:

• He told us [that the apartment is quiet and bright].

So:

• μας = recipient
• ότι το διαμέρισμα είναι ήσυχο και φωτεινό = content of the telling

A rough pronunciation guide is:

O me-SEE-tees mas EE-pe O-ti to thee-a-me-RI-sma EE-ne EE-see-ho ke fo-ti-NO

A few helpful stress points:

• μεσίτης → meSItis
• είπε → EIpe
• διαμέρισμα → diaMErisma
• είναι → EIne / EEne in many modern pronunciations
• ήσυχο → Isycho
• φωτεινό → fotiNO

Also note:

• αι in είναι is usually pronounced like e
• ει is usually pronounced like i
• χ in ήσυχο is like a soft throaty sound, not an English k

Yes, in many cases ότι and πως can both mean that after verbs like λέω.

So these are both possible:

• Ο μεσίτης μας είπε ότι το διαμέρισμα είναι ήσυχο και φωτεινό.
• Ο μεσίτης μας είπε πως το διαμέρισμα είναι ήσυχο και φωτεινό.

Both are natural. In this sentence, ότι is slightly more standard/neutral in written Greek, but πως is also very common.

Just do not confuse this πως with πώς meaning how. The accent matters in writing.

They would change to match the gender of the noun.

With ήσυχος / ήσυχη / ήσυχο and φωτεινός / φωτεινή / φωτεινό:

• masculine: ο χώρος είναι ήσυχος και φωτεινός
• feminine: η κουζίνα είναι ήσυχη και φωτεινή
• neuter: το διαμέρισμα είναι ήσυχο και φωτεινό

This agreement system is one of the most important patterns in Greek grammar.