why don't you tell us the dimensions of the room and where doors, windows, closets, radiators are...probably some creative solutions here. Are parents home during the day? If not, use the computer then, go out after dinner for a couple of hours, and retire to the bedroom. Have your main meal at lunch and perhaps just join them for coffee after their dinner.

It sounds like there is a computer room, his room, a guest room (or is taht the same room) and a basement. What is in the basement?

mg