Właścicielka mówi, że kaucja jest wysoka, ale w cenie są już media.

Właścicielka means female owner / landlady. The ending -ka often makes a noun feminine in Polish.

• właściciel = male owner / landlord
• właścicielka = female owner / landlady

So this sentence tells you that the speaker is talking about a woman.

mówi means says / is saying, and że means that.

So:

• Właścicielka mówi, że... = The landlady says that...

In Polish, że often introduces a subordinate clause, and it is normally preceded by a comma:

• mówi, że kaucja jest wysoka
• says that the deposit is high

That comma is standard Polish punctuation.

Kaucja means deposit, and it is a feminine noun in Polish. Because of that, the adjective must also be in the feminine form:

• wysoki = high (masculine base form)
• wysoka = high (feminine singular)

So:

• kaucja jest wysoka = the deposit is high

Polish often uses high for amounts of money, just like English does:

• wysoka cena = a high price
• wysoki czynsz = high rent
• wysoka kaucja = a high deposit

No, they are different:

• kaucja = security deposit
• czynsz = rent

So in a housing context:

• kaucja is the money you pay up front as a deposit
• czynsz is the regular rent payment

This is a very common distinction in Polish rental vocabulary.

Literally, w cenie means in the price.

Very often, though, it is used in the sense of:

• included in the price
• included in the rent / cost

So:

• ale w cenie są już media
  means naturally: but the utilities are already included in the price

This is a very common expression in ads and conversations about renting, hotels, services, and products.

Because media is treated as plural here.

• jest = is
• są = are

So:

• media są = the utilities are

Even though in English utilities can sometimes feel like one general category, in Polish media is grammatically plural in this meaning.

Here, media does not mean the media in the sense of TV, newspapers, or journalism.

In housing language, media usually means utilities or utility bills, such as:

• electricity
• water
• gas
• heating
• sometimes internet

So in a rental context, media is a very common word meaning the extra household charges.

Już usually means already.

In this sentence, it suggests that the utilities are already included, which can imply something like:

• they are included, not extra
• that part is taken care of
• you do not need to add them on top

So the sentence has the feel of:

• The deposit is high, but the utilities are already included in the price.

Yes, Polish word order is more flexible than English word order.

This sentence uses:

• w cenie są już media

Literally: in the price are already utilities

A more English-like order would be impossible in Polish, but Polish can move things around for emphasis. For example, you may also hear:

• media są już w cenie
• już są w cenie media — less neutral, more marked
• media już są w cenie

The version in your sentence is very natural and emphasizes w cenie early, which is useful because that is the important contrast after ale.

Polish does not have articles like English a / an / the.

So:

• właścicielka can mean the landlady or a landlady
• kaucja can mean the deposit or a deposit
• media can mean the utilities

You understand which one is meant from context. In this sentence, English would naturally use the:

• The landlady says that the deposit is high, but the utilities are already included in the price.

Jest is the 3rd person singular form of być (to be), meaning is.

So:

• kaucja jest wysoka = the deposit is high

In this sentence, Polish present tense works very similarly to English present tense:

• mówi = says / is saying
• jest = is
• są = are

Polish does not have a separate present continuous form like English is saying. The same form, mówi, can mean either says or is saying, depending on context.