muryo cheheomi issneun dedaga gongyong jubangdo isseoyo.

데다가 means something like on top of that, in addition, or besides that.

So 무료 체험이 있는 데다가 공용 주방도 있어요 gives the idea:

• there is a free trial
• and on top of that, there is also a shared kitchen

It is often used when one fact is being added to another, especially to make the overall point feel stronger.

Because 데다가 attaches to a clause, and the verb before it has to be in a form that can modify 데.

Here:

• 있다 = to exist / to have
• 있는 = the attributive form of 있다

So:

• 무료 체험이 있는 데다가 = on top of there being a free trial

This pattern is very common:

• A/V-는 데다가 for present actions/states with action verbs
• A-(으)ㄴ/은 데다가 with descriptive verbs/adjectives in appropriate forms

In this sentence, 있는 데다가 is the natural grammatical form.

있는 is the modifier form of 있다.

In Korean, verbs often change form when they come before a noun or a bound noun-like element. Here, 있는 modifies 데다가 through the phrase.

You can think of it as:

• 무료 체험이 있다 = there is a free trial
• 무료 체험이 있는 데다가 = in addition to there being a free trial

So 있는 is not a separate meaning like existing in the English adjective sense here. It is just the grammatical form needed before 데다가.

무료 체험 means free trial or free experience/sample use, depending on context.

Breakdown:

• 무료 = free of charge
• 체험 = experience, trial, hands-on use

In advertisements or service descriptions, 무료 체험 usually means a free trial.

So although 체험 literally relates to experience, in natural English this often gets translated as free trial rather than free experience.

이 is the subject marker.

• 무료 체험이 = the free trial / a free trial as the subject of 있다

In sentences with 있다, Korean often marks the thing that exists with 이/가:

• 무료 체험이 있어요 = there is a free trial
• 공용 주방이 있어요 = there is a shared kitchen

Here, the first part is:

• 무료 체험이 있는 데다가 = in addition to there being a free trial

So 이 is marking 무료 체험 as the thing that exists.

도 means also, too, or as well.

So:

• 공용 주방도 있어요 = there is also a shared kitchen

It adds the sense that this is another positive feature besides the free trial.

Compare:

• 공용 주방이 있어요 = there is a shared kitchen
• 공용 주방도 있어요 = there is also a shared kitchen

The 도 is important because it matches the additive meaning of 데다가.

공용 주방 means shared kitchen or communal kitchen.

Breakdown:

• 공용 = shared, for common use
• 주방 = kitchen

So this refers to a kitchen used by multiple people, such as in:

• a guesthouse
• dormitory
• shared housing
• office or common facility

Yes, they are both from 있다, but they are doing different jobs.

• 있는 = modifier form
• 있어요 = polite sentence-ending form

So:

1. 무료 체험이 있는 데다가

   • 있는 connects the first idea to 데다가

2. 공용 주방도 있어요

   • 있어요 finishes the whole sentence politely

This is completely normal in Korean. The same verb can appear in different forms within one sentence.

Because 데 is treated as a separate dependent noun in this grammar pattern, so it is written separately.

So the standard spacing is:

• 있는 데다가

not:

• 있는데다가

For learners, it is best to memorize this pattern with the space:

• -는 데다가
• -(으)ㄴ 데다가

Not always, but it is often used to pile one point on top of another, either positively or negatively.

For example:

• positive: 가격도 싸고 성능도 좋은 데다가 디자인도 예뻐요.

  • It’s cheap, performs well, and on top of that, the design is pretty.

• negative: 비도 오는데다가 바람도 많이 불어요.

  • It’s raining, and on top of that, it’s also very windy.

In your sentence, it is clearly being used positively to list attractive features.

Yes, that would be very natural too.

• 무료 체험도 있고 공용 주방도 있어요. = There’s also a free trial, and there’s also a shared kitchen.

The difference is mainly nuance:

• -고 simply links facts
• 데다가 adds a stronger on top of that feeling

So 데다가 sounds a bit more like the speaker is building up reasons or advantages.

Using 이/가 is natural here because the sentence is focusing on the existence of that feature.

• 무료 체험이 있다 = there is a free trial

If you used 은/는, the nuance would shift more toward topic or contrast:

• 무료 체험은 있는 데다가...
  • As for the free trial, there is one, and...
  • This can sound contrastive or specially emphasized depending on context.

So 이 is the most neutral and natural choice here.

있어요 is the standard polite informal style, often called 해요체.

It is appropriate in many everyday situations, such as:

• talking to customers casually but politely
• general conversation
• advertisements
• descriptions on websites
• speaking to someone you do not know well

It is less formal than:

• 있습니다

and more polite than:

• 있어

So the sentence sounds polite and natural for everyday use.

A rough breakdown is:

• 무료 체험이 = a free trial
• 있는 = existing / there being
• 데다가 = on top of that, in addition
• 공용 주방도 = a shared kitchen also
• 있어요 = there is

Very literally:

• On top of there being a free trial, there is also a shared kitchen.

A more natural English rendering would be:

• There’s a free trial, and on top of that, there’s also a shared kitchen.