First two years of college we had to live on campus in a dorm. After that I moved off campus in rentals.
My dorm roommates were "chosen" for me - in other words - I didn't have a say-so - let alone know who they were until our first day meeting them in person.
Both times things worked out fine, outside the usual little skirmishes typical of living with another person tends to create.
My first year's roommate came from Tampa where his parents ran the Lafeyette Electronics franchise and he had this HUGE reel to reel stereo and would play ELP at high volume- which was pretty cool.
Second year it was more Neil Young and Bob Dylan category.
Those were some great times.
It's a great opportunity for your son, LWJ - no matter how it turns out. Don't be afraid to spin the wheel and let 'er rip.....