Căn hộ này rất sạch.

In Vietnamese, demonstratives like này (this) usually come after the noun.

So:

• căn hộ này = this apartment
• literally, it is closer to apartment this

This is a very common Vietnamese pattern:

• người này = this person
• cuốn sách này = this book
• xe này = this vehicle / this car

So even though English says this apartment, Vietnamese says apartment this.

Vietnamese often does not use a copula like is/am/are before adjectives.

So:

• Căn hộ này rất sạch.
• literally: Apartment this very clean.

But the natural English meaning is This apartment is very clean.

This is normal in Vietnamese when describing something with an adjective:

• Cô ấy đẹp. = She is beautiful.
• Trời nóng. = The weather is hot.
• Nhà lớn. = The house is big.

So the idea of is is understood without saying it.

Rất means very.

So:

• sạch = clean
• rất sạch = very clean

You do not have to include it. If you remove it:

• Căn hộ này sạch. = This apartment is clean.

Adding rất just makes the description stronger.

A small usage note:

• In everyday Vietnamese, rất is extremely common before adjectives.
• It works much like very in English.

Căn hộ means apartment.

About căn:

• Yes, căn can function like a classifier for certain buildings or rooms.
• But in căn hộ, the combination is best learned as a fixed vocabulary item meaning apartment.

So for a beginner, it is easiest to remember:

• căn hộ = apartment
• hộ by itself is not normally used in everyday speech to mean apartment

You may also see:

• một căn hộ = an apartment / one apartment
• căn nhà = a house

So căn often appears with homes or enclosed spaces.

In this sentence, sạch means clean and behaves like a descriptive word that can directly form the predicate.

English learners often ask whether it is an adjective or verb because Vietnamese does not need is. The simplest answer is:

• it is usually called an adjective
• but Vietnamese adjectives can stand directly after the subject without a separate is

So in:

• Căn hộ này rất sạch.

sạch is the main describing word of the sentence.

A rough guide for English speakers:

• căn: somewhat like gun but with a shorter vowel and a different tone
• hộ: roughly like hoh with a heavy falling tone
• này: roughly like nye with a falling tone
• rất: short, clipped, with a rising-broken tone depending on dialect
• sạch: roughly like sach with a low, sharp ending

A more useful point than English-style approximation is to notice the tones:

• căn = level tone
• hộ = heavy/falling tone
• này = falling tone
• rất = sắc/ngã-related contour depending on dialect spelling and pronunciation conventions
• sạch = nặng tone

If you are learning pronunciation, it is best to hear this from native audio, because Vietnamese tones and final consonants matter a lot.

Yes. The exact English translation depends on context.

Căn hộ is a general word for a self-contained housing unit in a larger building. Depending on the situation, it may be translated as:

• apartment
• flat
• condo or condominium in some contexts

If you are just learning the sentence, apartment is the safest basic meaning.

Yes, you could.

Both are natural, but they feel a little different:

• Căn hộ này rất sạch. = This apartment is very clean.
• Căn hộ này sạch lắm. = This apartment is really/so clean.

A simple way to think about it:

• rất is a straightforward intensifier like very
• lắm can sound a bit more expressive or conversational

Both are common, but rất sạch is especially easy and neutral for learners to start with.

For sentences like this, that pattern is very common:

• [noun] + này + rất + [adjective]

Example:

• Căn hộ này rất sạch.
• Chiếc xe này rất đắt. = This car is very expensive.
• Ngôi nhà này rất đẹp. = This house is very beautiful.

But not every sentence in Vietnamese follows this exact pattern. What is happening here is:

• căn hộ này = the subject noun phrase
• rất sạch = the description

So this sentence follows a very common descriptive pattern, but Vietnamese has many other sentence types too.