When the line is drawn at these locations - i.e. it only matters that it's above the ground floor but it isn't the penthouse, what is a single word to refer to those floors as?
For example: Alex lives in a basement bedroom, Bob lives in a ground floor bedroom, Charlie lives in a ____ bedroom, Delta lives in a penthouse studio.
Mid-level
adjective 1. middle-level.
Alex lives in a basement bedroom, Bob lives in a ground floor bedroom, Charlie lives in a mid-level bedroom ( but she has an upper floor fetish ), Delta lives in a penthouse studio.
It works with the context in the example you have given. All though to just say, my best friend live in a mid-level apartment, would be ambiguous as it could refer to class or economic status or size.
Storey, floor or level.
Sounds like you might be confusing terminology a little though. A penthouse isn't the top floor or top storey in every building, only in residential/hotel buildings (and again, not all residential buildings have a penthouse).
They are the upper floors or the higher floors. That is as precise as we can get, I believe.
