O anúncio dizia que o apartamento já está mobiliado e disponível.

Dizia is the imperfect form of dizer (to say).

Here, O anúncio dizia... means something like The ad said... or The listing stated...

Why dizia instead of disse?

• dizia often sounds natural when you are reporting the content of something written, like an ad, sign, or message
• it can give a sense of this is what it said / this was the wording
• disse is more like said as a completed event

So:

• O anúncio dizia que... = The ad said/stated that...
• O anúncio disse que... is less natural, especially because an ad is written text, not a person speaking

This is a very common question.

Even though dizia is past, Portuguese can keep está in the present if the speaker is treating the information as still current or still being presented as true.

So this means:

• the ad said
• that the apartment is already furnished and available

This is similar to English, where you might also say:

• The ad said that the apartment is furnished and available

If you said estava, that would suggest the apartment was furnished and available at that past time, but maybe not anymore.

So:

• dizia que... está... = the ad said this is the current status
• dizia que... estava... = the ad said this was the status at that time

Já usually means already.

In this sentence, it adds the idea that the apartment is already furnished and available, meaning it is ready now, not something that will happen later.

It often gives a sense of:

• already
• by now
• as it is

So já está mobiliado suggests the apartment comes furnished already.

Mobiliado means furnished.

It comes from the verb mobiliar (to furnish), but here it is functioning like an adjective.

So:

• apartamento mobiliado = furnished apartment
• está mobiliado = it is furnished

In Brazilian Portuguese, mobiliado is very common in real-estate language.

Portuguese uses definite articles much more often than English.

So where English often says:

• the apartment
• or sometimes just apartment in headlines or short descriptions

Portuguese more naturally says:

• o apartamento

Here it refers to the specific apartment mentioned in the ad, so o is very natural.

Que here means that and introduces the clause after dizia.

So:

• O anúncio dizia que... = The ad said that...

In English, that is often optional:

• The ad said the apartment...
• The ad said that the apartment...

In Portuguese, que is normally kept in this structure.

Because they are describing the state or condition of the apartment after the verb estar.

This is the same basic idea as:

• O apartamento está limpo. = The apartment is clean.
• O apartamento está disponível. = The apartment is available.

So mobiliado and disponível are predicate adjectives here: they describe the apartment after está.

Here disponível means available, especially in a housing or rental context.

So it suggests the apartment is:

• available to rent
• available to move into
• not taken yet

It does not mean available in the sense of a person being free for a date, unless the context is about people. The word itself can be used for both, but here it clearly refers to the apartment’s status.

Usually yes.

já está mobiliado e disponível is normally understood as:

• already furnished
• and already available

In other words, já naturally spreads over the whole description that follows, unless context suggests otherwise.

Because anúncio is a masculine noun in Portuguese, so it takes o:

• o anúncio

This is something you simply have to learn with the noun. Grammatical gender in Portuguese does not always match any logic from English.

Anúncio is pronounced approximately like ah-NOON-see-oh, with stress on nú.

The accent mark in anúncio shows the stressed syllable:

• a-nún-ci-o

It also helps signal the correct pronunciation pattern. For learners, the important thing is to stress the middle syllable, not the first or last.

Yes, that is grammatically possible, but the meaning shifts a little.

• já está mobiliado e disponível = the ad said this is the apartment’s current status
• já estava mobiliado e disponível = the ad said it was already furnished and available at that past time

So both can work, but está keeps the information more alive or current.

It is very common in Brazilian Portuguese.

You may also see mobilado in European Portuguese. Both mean furnished, but mobiliado is the form a learner of Brazilian Portuguese should definitely recognize and use.