NRP - I think just knowing that your son takes good values and trusting him to make good choices is most important. We all hear the stories of the kids gone bad, but truth is your son will meet many more great kids that are on good paths making mature decisions than the opposite.
Having an open line of communication with him in case things go wrong or he makes a poor choice is most important IMO.
As far as the rooms go, it might be good for your son to talk to some other players or inquire when he talks to the coach next, about what is the preferred housing arrangement for players.