I'm playing The Sims 2 right now. Specifically, a high-rise apartment building that I built in the downtown neighborhood. It's a little dingy-looking but by the standards of real cities it's pretty decent. I'm not sure if I'd actually be rooming with my Sim household or just living in the same building, but either way I'm okay with this. The Sim I'm playing is a cool guy; we'd probably get along as roommates. Or at least drive each other equally crazy, instead of one of us clearly being "the bad roommate".
Also I kind of think of myself in Sim terms anyway. And on top of that, the supernatural stuff in the Sims world would be awesome to see in action, since I've always wished our world had similar things.