יש גיטרה בחדר שלי, אבל הפסנתר בבית של ההורים שלי.

יש means there is or there are. It is the standard Hebrew way to say that something exists or is present somewhere.

So:

יש גיטרה בחדר שלי = There is a guitar in my room

A useful thing to know: יש does not change for gender or number.

• יש גיטרה = there is a guitar
• יש גיטרות = there are guitars

Because in present-tense Hebrew, the verb to be is usually not said.

So Hebrew often says:

• הפסנתר בבית של ההורים שלי

literally: the piano in/at my parents' house

but it means:

• The piano is at my parents' house

This is completely normal Hebrew. In the past or future, Hebrew does use forms of to be, but in the present it usually leaves them out.

Because גיטרה is being introduced as something not yet identified, while הפסנתר is a specific piano.

• גיטרה = a guitar
• הפסנתר = the piano

After יש, Hebrew usually introduces something indefinite:

• יש גיטרה... = there is a guitar...

But in the second clause, the sentence is talking about a particular piano, so it uses the definite article ה־:

• הפסנתר = the piano

This difference is very natural in Hebrew.

Because the second half is not mainly saying that a piano exists. It is saying where a specific piano is.

So Hebrew prefers:

• אבל הפסנתר בבית של ההורים שלי
• but the piano is at my parents' house

If you said:

• אבל יש פסנתר בבית של ההורים שלי

that would usually mean:

• but there is a piano at my parents' house

That sounds more like you are introducing the existence of a piano there, not contrasting the location of a known piano.

The Hebrew preposition ב־ is broader than English in. Depending on context, it can mean in, at, or sometimes on/inside in a natural English translation.

So here:

• בחדר שלי = in my room
• בבית של ההורים שלי = literally in my parents' house, but in natural English often at my parents' house

Hebrew uses the same preposition ב־ in both places; English just translates it differently depending on what sounds natural.

That is a normal Hebrew way to show possession.

Hebrew often says:

• החדר שלי = my room
• literally: the room of mine

So:

• בחדר שלי = in my room

English puts the possessive word first (my room), but Hebrew commonly puts שלי after the noun.

This phrase is built in parts:

• בית = house
• של = of
• ההורים שלי = my parents

So:

• בית של ההורים שלי literally = house of my parents

In natural English, that becomes:

• my parents' house

So the whole phrase:

• בבית של ההורים שלי

means:

• in/at my parents' house

Hebrew often uses של where English uses apostrophe-s.

Because my parents is definite: it refers to specific parents.

In modern Hebrew, phrases with שלי, שלך, שלו, etc. are usually definite, so the noun often has ה־:

• הספר שלי = my book
• החדר שלי = my room
• ההורים שלי = my parents

So ההורים שלי is the normal way to say my parents.

This is a very common question, because Hebrew spelling without vowel marks does not show everything.

The prefix ב־ can mean:

• be- = in
• or ba- = in the / at the

When ב־ combines with the definite article ה־, the pronunciation becomes ba-, but the spelling still looks the same.

So in this sentence, because the phrases are definite:

• בחדר שלי is normally pronounced ba-cheder sheli
• בבית של ההורים שלי is normally pronounced ba-bayit shel ha-horim sheli

Even though the written form does not show the extra ה־ clearly, the definiteness is understood from the context.

Yes. That is completely natural.

Both are correct:

• יש גיטרה בחדר שלי
• בחדר שלי יש גיטרה

The difference is mainly in focus.

• יש גיטרה בחדר שלי starts with the existence idea: there is a guitar...
• בחדר שלי יש גיטרה starts with the location: in my room, there is a guitar

Hebrew allows this kind of flexibility more easily than English does.