BU is in an okay neighborhood - on the studenty side (I don't know if I mean that in a good or bad way). I can't speak for BC since I've never been drunk enough to fall asleep on the T and end up all the way out there. I hear the law school isn't at BC itself but requires further travel on a shuttle (of the bus, not space, variety). It's supposed to be a nice campus though. BU's building is one of the worst in the nation.
Who re-writes Disney songs? I've wondered this myself. It's a tradition at BU to have a sort-of law school musical in the winter with lots of lyric re-writing. I've heard this happens at other schools (Harvard, BC, and Yale) and people from UF, UT, Hastings, and Tulane have all told me they don't know what I'm talking about - so I don't know if it's a common tradition or not.