The college time is supposed to be fun, exciting, hang out, make up, totally wasted, sucked, etc. And it is a onetime experience. Mine is a home-stay one, with my father. College was a stop between one subway stop and one bus stop.
Graduate school is different, especially at a business school, as one of the basic entry requirements is two years of experience. That makes big difference. Someone earned a bit and afford living alone. Someone has stable relationship. Someone even has established a family.
Exchange semester was a fun period of time. 4-5 months in a different country, the workload was light and the scores do not count. And most fun thing was even better diversification.
It has been 15 years and I start thinking of those old buddies!