yama no ue no hoteru ha miharasi ga yokute, yoru no sora no hosi mo miemasu.

の is a very common linking particle. It often works like of, ’s, or simply turns one noun into a modifier for another noun.

In this sentence:

• 山の上 = the top of the mountain / on the mountain
• 山の上のホテル = the hotel on top of the mountain
• 夜の空 = the night sky
• 夜の空の星 = the stars in the night sky

So the repeated の is not unusual. Japanese often chains nouns together this way.

Yes, 山の上 is functioning as one phrase.

• 山 = mountain
• 上 = top / above / upper part
• 山の上 = on the mountain / at the top of the mountain / up on the mountain

Then that whole phrase modifies ホテル:

• 山の上のホテル = the hotel on top of the mountain

So the structure is basically:

[mountain-top] + hotel

は marks the topic of the sentence.

Here, the sentence is talking about the hotel on top of the mountain as the main topic:

• 山の上のホテルは = As for the hotel on top of the mountain, ...

After that, the sentence gives information about it:

• it has a good view
• you can also see the stars

So は does not simply mean subject in the same way as English. It marks what the speaker is talking about.

見晴らし means view, outlook, or visibility from a place.

• 見晴らしがいい / よい = to have a good view
• 見晴らしがよくて = the view is good, and ...

The particle が marks 見晴らし as the thing being described by いい / よい.

So:

• 見晴らしがいい = the view is good

This is a set expression in Japanese. English learners sometimes expect は, but が is very natural here.

Because いい is irregular.

The word いい comes from よい, and when it changes form, it usually behaves like よい, not like the plain form いい.

So:

• dictionary/plain: いい
• adverb/te-linking form: よくて

That is why the sentence uses:

• 見晴らしがよくて、... = the view is good, and ...

The て form here connects the first idea to the second one.

It connects two related statements.

So this sentence is basically:

• The hotel on top of the mountain has a good view, and you can also see the stars in the night sky.

The て form often works like:

• and
• and because
• so

Here, the safest understanding is simply and:

• 見晴らしがよくて、夜の空の星も見えます。

It links the nice view with the fact that the stars are visible too.

This is a very common learner question.

• 見る = to look at / to see intentionally
• 見える = to be visible / can be seen

Here, the meaning is not someone looks at the stars on purpose.
It is the stars are visible from that hotel.

So:

• 星が見えます = the stars can be seen / the stars are visible
• 星を見ます = (someone) looks at the stars

That is why 見えます is the natural choice.

も means also or too.

So:

• 夜の空の星も見えます = you can also see the stars in the night sky

The idea is that the hotel already has one good point:

• the view is good

And in addition:

• the stars are also visible

So も adds another nice feature.

Yes. 夜の空の星 is perfectly understandable and natural, but Japanese also has other ways to say similar things.

This phrase breaks down as:

• 夜 = night
• 夜の空 = the night sky
• 夜の空の星 = the stars in the night sky

A shorter expression you may also see is:

• 夜空の星

Here, 夜空 already means night sky, so:

• 夜空の星 = the stars in the night sky

Both are fine. The version in your sentence is just slightly more explicit.

Grammatically, the thing that is visible is the stars.

So the understood idea is:

• 夜の空の星も見えます
  = The stars in the night sky are also visible

From an English point of view, you might translate it as:

• You can also see the stars
• The stars are also visible

Japanese often leaves subjects unstated when they are obvious from context.

A natural reading is:

やま の うえ の ホテル は みはらし が よくて、よる の そら の ほし も みえます。

Word readings:

• 山 = やま
• 上 = うえ
• 見晴らし = みはらし
• 夜 = よる
• 空 = そら
• 星 = ほし
• 見えます = みえます

One small note: in normal speech, ホテル is the Japanese pronunciation of hotel, so it sounds like hoteru.