Hello, all..
I'm a third year at UIC. Here's some answers to the questions...
1. living
many live on campus, many live off for the first year or two. I'd say possibly half-half. After the first two years, of course, we're all over the city at the various sites, so many people then move to bucktown (it seems!) or elsewhere. I live near campus, and find it convenient...
2. competitive
you can take the premed out of the student... well, competition exists everywhere i suspect, but it really isn't bad at all. people try to help, tutoring is really big, sharing resources all the time, and the coop system (the class gets together, hires someone from the class to write the notes for a lecture, and depends on that person...). Always a bad apple, but on the whole, it's really not a terribly competitive atmosphere.
3. any other questions...