I've never had a same-room room mate, so my answer might be biased. Personally I think I'd hate living in the same room as someone else =P Small things like getting dressed/undressed would annoy me to death, and I like having a room to work in during the late hours. And having a boyfriend wouldn't work too well.

On the other hand, my experiances finding apartments, both here and in California has been pleasant. When do you have to respond to the Residence offer? Maybe you could look for other housing in the mean time, and if you don't find any, take residence.