Di pojok ruang tamu, ada kursi kecil untuk nenek.

Here, di is a preposition meaning in, at, or on, depending on context. In di pojok, it means in/at the corner.

A useful thing to remember:

• di + place = written separately
  
  • di rumah = at home
  • di meja = on the table

This is different from the passive verb prefix di-, which is written attached:

• dibuka = opened
• ditulis = written

So di pojok is correct because pojok is a location.

Indonesian often puts location information first if the speaker wants to set the scene or emphasize where something is.

So:

• Di pojok ruang tamu, ada kursi kecil untuk nenek.
  = In the corner of the living room, there is a small chair for grandmother.

A more neutral order is also possible:

• Ada kursi kecil untuk nenek di pojok ruang tamu.

Both are natural. The version with Di pojok ruang tamu at the beginning highlights the location first.

Ada is used to show that something exists or is present somewhere. In many cases, it corresponds to English there is or there are.

So:

• ada kursi kecil = there is a small chair

In this sentence, ada introduces the existence of the chair in that location.

Examples:

• Di kamar ada meja. = There is a table in the bedroom.
• Di luar ada mobil. = There is a car outside.

In Indonesian, adjectives usually come after the noun.

So:

• kursi kecil = small chair
• rumah besar = big house
• tas merah = red bag

This is one of the most important word-order differences from English.

Yes, literally:

• ruang = room/space
• tamu = guest

But in actual usage, ruang tamu means living room or guest-receiving room, not usually guest bedroom.

So in this sentence, ruang tamu is the normal word for living room.

In Indonesian, two nouns are often placed together to show a relationship like X of Y.

So:

• pojok ruang tamu = the corner of the living room
• pintu rumah = the door of the house / the house door
• warna mobil = the color of the car

Using dari here would sound unnatural. Indonesian usually does not need a word equivalent to English of in expressions like this.

Both can relate to corner, but they are not always identical.

• pojok often means a physical corner of a room or area
• sudut can also mean corner, but it can additionally mean angle

In a sentence about furniture in a room, pojok sounds very natural:

• di pojok ruang tamu = in the corner of the living room

You may also hear di sudut ruangan, which is also possible, but pojok is very common in everyday speech for this kind of situation.

Untuk usually means for.

So:

• untuk nenek = for grandmother / for grandma

It shows that the chair is intended for, meant for, or designated for the grandmother.

Examples:

• hadiah untuk ibu = a gift for mother
• air untuk tamu = water for the guest

Depending on context, untuk nenek could mean:

• the chair is meant for her to use
• the chair has been set aside for her

Indonesian does not usually use articles like English a, an, or the.

So:

• kursi kecil can mean a small chair or the small chair, depending on context.

In this sentence, English naturally translates it as a small chair, because the sentence is introducing it with ada.

If Indonesian speakers want to make something more specific, they often rely on:

• context
• word order
• demonstratives like ini (this) or itu (that)

For example:

• kursi kecil itu = that small chair / the small chair

In this sentence, nenek is being used as a common noun meaning grandmother or grandma, so it is normally written with a lowercase letter.

Capitalization depends on how it is used:

• untuk nenek = for grandmother / for grandma
• Nenek datang. = Grandma is coming.
  Here, some writers may capitalize it if it functions like a name or direct family title.

In ordinary sentence writing, lowercase nenek is completely normal.

The comma is helpful, but not always strictly necessary.

With the comma:

• Di pojok ruang tamu, ada kursi kecil untuk nenek.

Without the comma:

• Di pojok ruang tamu ada kursi kecil untuk nenek.

Both are understandable. The comma simply marks a pause after the fronted location phrase, especially in careful writing.

Usually, ada is the most natural choice here because the sentence is expressing existence: there is a chair.

• Di pojok ruang tamu, ada kursi kecil untuk nenek. = natural

If you remove ada:

• Di pojok ruang tamu, kursi kecil untuk nenek.

That sounds incomplete or unnatural in most contexts, because it no longer clearly says that the chair exists/is there.

So for this kind of sentence, ada is important.

Not necessarily. Untuk nenek most directly means for grandmother, not automatically belonging to grandmother.

It suggests purpose or intended use.

If you specifically want to say it is grandmother’s chair, Indonesian might say:

• kursi nenek = grandmother’s chair
• kursi milik nenek = a chair belonging to grandmother

So:

• kursi kecil untuk nenek = a small chair for grandmother
• kursi kecil nenek = grandmother’s small chair

Those are related, but not exactly the same.