I recall talking about sharing a bunk room too when Solari was writing his logs. More senior officers (Lt. And Lt. Cdr) would likely share a room, particularly on smaller ships. Captain would have their own and a small office. XOs on larger ships would have theor own, but may share with another officer of the same rank on a smaller ship.
I envision junior officers (Lt. Jr down to cadet) could have 2 or even 4 to a room.
Any enlisted would have to share at least 4 to a room I reckon.
Part of me thinks these are quite conservative though. With 80 personnel, you’d need about 15 to 20 rooms. This number could be reduce to 10 to 15 if you put more personnel per room.