La brua restoracio ĝenas min, do mi preferas la pli silentan kafejon.

The verb ĝeni works like English to bother, to annoy, or to disturb.

So in Esperanto, the thing causing the annoyance is the subject:

• La brua restoracio ĝenas min = The noisy restaurant bothers me

Here:

• la brua restoracio is the subject
• min is the direct object

English sometimes prefers a passive-style idea like I am bothered by the noisy restaurant, but Esperanto often uses the more direct active structure with ĝeni.

Because min is the direct object.

In Esperanto, the ending -n marks the direct object of a verb. Since the restaurant is doing the bothering, and I/me am receiving that action, you need min:

• mi = I
• min = me

So:

• La restoracio ĝenas min = The restaurant bothers me

If you said ĝenas mi, that would be grammatically wrong.

Because la pli silentan kafejon is the direct object of preferas.

The verb preferi means to prefer, and the thing you prefer is the object:

• Mi preferas la kafejon = I prefer the café

So kafejo becomes kafejon because of the object marker -n.

Because adjectives in Esperanto agree with the nouns they describe.

Since kafejon is:

• singular
• direct object

the adjective describing it must match:

• silenta kafejo = a quiet café
• silentan kafejon = a quiet café, as a direct object

So both words take the appropriate endings:

• kafejo → kafejon
• silenta → silentan

This matching is a very important feature of Esperanto.

Because it is the subject, not the object.

In:

• La brua restoracio ĝenas min

the restaurant is performing the action of bothering, so it stays in the basic form:

• restoracio
• brua

Only the object gets -n, which is why you have min.

Do means so, therefore, or thus.

It links the two ideas:

• The noisy restaurant bothers me
• so I prefer the quieter café

So do shows a result or conclusion.

It is not exactly the same as ĉar:

• ĉar = because
• do = so / therefore

Compare:

• La brua restoracio ĝenas min, do mi preferas la pli silentan kafejon.
  The noisy restaurant bothers me, so I prefer the quieter café.

• Mi preferas la pli silentan kafejon, ĉar la brua restoracio ĝenas min.
  I prefer the quieter café because the noisy restaurant bothers me.

Esperanto forms the comparative with pli, which means more.

So:

• silenta = quiet
• pli silenta = quieter / more quiet

Esperanto does not add a special ending like English -er. It uses the same system for all adjectives:

• bela = beautiful
• pli bela = more beautiful
• granda = big
• pli granda = bigger

That makes comparatives very regular.

Because the speaker is talking about a specific café: the quieter café, not just a quieter café.

So:

• pli silenta kafejo = a quieter café
• la pli silenta kafejo = the quieter café

In the sentence, that whole phrase is the object, so it becomes:

• la pli silentan kafejon

Also, note that this is still a comparative, not a superlative:

• pli silenta = quieter
• plej silenta = quietest

So la pli silentan kafejon means the quieter café, not the quietest café.

Usually, no. Esperanto normally states the subject pronoun clearly.

In the second clause:

• do mi preferas...

you need mi because the verb form preferas does not itself show person the way some languages do. It can mean:

• I prefer
• you prefer
• he/she prefers
• they prefer

So the pronoun is needed to show who the subject is.

Yes. This is a useful example of Esperanto word-building.

• kafeo = coffee
• -ej- = place for something
• kafejo = coffee place, café

So kafejo is built from the idea of coffee plus the place suffix -ej-.

This suffix appears in many words:

• lerni = to learn

• lernejo = school, a place for learning

• kuiri = to cook
• kuirejo = kitchen, a place for cooking

So kafejo is not just another form of kafeo; it is a different word made from the same base idea.

Both are adjectives, and adjectives in Esperanto end in -a.

• bruo = noise

• brua = noisy

• silento = silence
• silenta = silent, quiet

So when you see -a, that usually tells you the word is being used as an adjective.

In this sentence:

• brua restoracio = noisy restaurant
• silenta kafejo = quiet café

Esperanto word order is fairly flexible, mainly because the -n ending shows the direct object.

The normal, clear order here is:

• La brua restoracio ĝenas min

But you could also say things like:

• Min ĝenas la brua restoracio

That still means The noisy restaurant bothers me, because min has the object marker -n.

Even so, the original order is the most straightforward and natural for learners:

• subject + verb + object

So yes, word order can change, but the version in your sentence is a very standard one.

Ĝ is pronounced roughly like the j in judge.

So ĝenas begins with a sound similar to:

• JEH-nas

More exactly:

• ĝ = English j sound
• e = like e in bed
• a = like a in father

So ĝenas is approximately JEH-nahs.

This letter is different from:

• g as in go
• ĵ, which sounds more like the s in measure or the zh sound in vision