Usage patterns
〈場所〉の個室に泊まるto stay in a private room at 〈場所〉
I decided to stay in a private room at the hospital.
個室を予約するto reserve a private room
I reserved a private room for the birthday party.
個室で食事をするto have a meal in a private dining room
I had a meal with a client in a private dining room.
個室に入るto enter a toilet stall
I entered the toilet stall and locked the door.