Here's a google maps street view of the dorm building.
http://goo.gl/maps/StzfC
It's in a residential neighborhood and there are 3 other dorms from the same school in the area. (Across the street, around the corner, etc.)
The ages range from 14 to 22 and all the dorms had the same combo.
The whole thing about getting his own room as a reward? No such thing. Most people had roommates due to lack of space. If someone left or there happened to be enough room, whoever happened to get that single room got it.
Btw, the dorm was unused for a year. During that time they did minor construction and changed that room into a shower room with 3 shower stalls.