Supre en la hotelo estas trankvila salono, sed sube estas brua restoracio.

Esperanto word order is quite flexible. Starting with Supre puts the location first, a bit like saying Upstairs, in the hotel, there is a quiet lounge.

So:

• Supre = above / upstairs
• en la hotelo = in the hotel
• estas trankvila salono = there is a quiet lounge

This is very natural in Esperanto. The speaker is first setting the scene, then saying what is there.

They are adverbs of place.

• supre = above, upstairs, on the upper level
• sube = below, downstairs, on the lower level

In this sentence, they describe relative position within the hotel:

• Supre en la hotelo... = Upstairs in the hotel...
• sube... = downstairs...

They do not have the -n ending here, because they are simply describing location, not motion toward somewhere.

Because en means in. The phrase en la hotelo tells you the place where these things are located.

• en = in
• la hotelo = the hotel

So en la hotelo = in the hotel.

Without en, the meaning would change or become unclear.

This is the common Esperanto way to express there is / there are.

• estas trankvila salono literally means is a quiet lounge
• in natural English, we say there is a quiet lounge

Esperanto usually does not need a separate word for English there in this kind of sentence. The verb estas is enough.

So:

• estas trankvila salono = there is a quiet lounge
• estas brua restoracio = there is a noisy restaurant

Because Esperanto often expresses existence without a dummy subject like English there.

English says:

• There is a lounge
• There is a restaurant

Esperanto simply says:

• Estas salono
• Estas restoracio

So the sentence structure is different from English, even though the meaning is the same.

Because they are adjectives.

In Esperanto:

• nouns end in -o
• adjectives end in -a
• adverbs end in -e

So:

• salono = lounge
• restoracio = restaurant
• trankvila = quiet
• brua = noisy

The adjectives describe the nouns:

• trankvila salono = a quiet lounge
• brua restoracio = a noisy restaurant

Yes. In Esperanto, adjectives agree with the nouns they describe in number and case.

Here both nouns are singular and not in the accusative, so the adjectives stay in the basic -a form:

• trankvila salono
• brua restoracio

If the nouns were plural, the adjectives would also become plural:

• trankvilaj salonoj
• bruaj restoracioj

Because nothing here is a direct object, and there is no expression of motion toward a place.

This sentence is describing where things are located:

• Supre = upstairs
• en la hotelo = in the hotel
• sube = downstairs

These are location ideas, not movement. So no accusative -n is needed.

Compare:

• Mi estas en la hotelo. = I am in the hotel.
• Mi iras en la hotelon. = I go into the hotel.

In your sentence, everything is static.

Sed means but.

It connects two contrasting ideas:

• upstairs there is a quiet lounge
• downstairs there is a noisy restaurant

So sed shows the contrast between trankvila and brua, and also between supre and sube.

La is the definite article, meaning the.

• la hotelo = the hotel
  This hotel is already understood or specific.

But:

• trankvila salono = a quiet lounge
• brua restoracio = a noisy restaurant

There is no article here because Esperanto has no indefinite article. So a bare noun can often mean a/an in English.

That is why:

• salono can mean a lounge
• restoracio can mean a restaurant

Yes. Esperanto allows several word orders, although some sound more natural depending on emphasis.

For example, you could also say:

• En la hotelo supre estas trankvila salono, sed sube estas brua restoracio.
• Trankvila salono estas supre en la hotelo, sed brua restoracio estas sube.

These are understandable, but the original version sounds very natural because it emphasizes location first:

• Supre...
• sube...

Not exactly, but they are similar.

• supre en la hotelo = upstairs / up in the hotel
• en la supra parto de la hotelo = in the upper part of the hotel

The original is shorter and more natural in ordinary speech. The longer version is more explicit and a bit heavier.

Likewise:

• sube is simpler and more natural than a longer phrase like en la malsupra parto

They are adverbs, because they end in -e.

In Esperanto, the ending often tells you the word class:

• supra = upper, above-related (adjective)
• supre = above, upstairs (adverb)
• suba = lower, below-related (adjective)
• sube = below, downstairs (adverb)

In your sentence, adverbs are needed because they describe the location of the whole situation, not a noun directly.

Trankvila usually means quiet, calm, peaceful, while silenta means silent.

A lounge in a hotel is normally described as trankvila if it is pleasantly calm, not necessarily completely silent.

So:

• trankvila salono = a calm/quiet lounge
• silenta salono = a silent lounge

The first sounds more natural in this context.

Usually brua means noisy.

It comes from bruo, meaning noise. So:

• bruo = noise
• brua = noisy

A brua restoracio is a restaurant with a lot of noise. In many contexts, English might also say loud, but noisy is the better direct match.

A rough pronunciation guide for an English speaker is:

SOO-preh en lah ho-TEH-loh ES-tahs trahnk-VEE-lah sah-LOH-noh, sed SOO-beh ES-tahs BROO-ah res-to-ra-TSI-oh

A few helpful points:

• e is like e in bet
• o is like o in for, but pure and short
• u is like oo in food
• c is always ts
• stress is always on the second-to-last syllable

So:

• hotelo → ho-TE-lo
• salono → sa-LO-no
• restoracio → res-to-ra-CI-o

You would make the nouns plural with -j, and the adjectives would also become plural.

For example:

• Supre en la hotelo estas trankvilaj salonoj, sed sube estas bruaj restoracioj.

That means:

• trankvilaj salonoj = quiet lounges
• bruaj restoracioj = noisy restaurants

This shows adjective agreement in number.