Ever seen "My Fair Lady"? My Ideal room is Henry Higgin's library, with someone to keep the fire going and a steady supply of tea. A stack of sketch books to draw whenever I felt like it, and books on every possible subject that might strike my fancy. No TV, no phone, and kerosene & candles for light. OK, enough fantasy land. My dream room is any space that dusts itself!
I think what *makes* the perfect room is the little things like knick-knacks. Now I don't necessarily mean cheesy cheap figurines or anything... but you know, the stuff from Pottery Barn, Crate and Barrell, etc.. The candles holders, small picture wall shelves, etc. I think that brings a room together and keeps it from feeling too "museum like."