My perfect gaming environment is one which eliminates distractions for the GM and players (i.e. no TVs and video game consoles in the room), has convenient shelving for relevant game books, and walls covered with evocative art. My game room at home (with its Geek Chic table, Keurig, and mini-fridge) is close. Ideally, I’d like a built-in sound system (instead of the kludge of speaker wires I have now) and a drop-down video screen (I like ambient sounds and I play opening crawls during Star Wars games; I’m sure a GM-usable video screen could come in handy for other visual aids from time to time).
Granted some of those things (video screen) are purely luxury items and not strictly necessary to run an excellent game. But, that’s not what this question was about. :p