I'm teeny bit wary of that since the pay doesn't sound great and I'd hate the idea of tying your housing situation to your employment. Even if you do have enough free time to work another job and you find one that pays better or you like more, are they going to honor that when it's your scheduled time off and a couple of people call out sick and they're short-staffed? Or what about if it's just your regular time off and you want to do something other than work?

$650ish a month is on the low end of rent if you were finding a roommate and lucking out a little. Getting that without utilities is great if you don't have to share the room, but the arrangement seems like a problem waiting to happen.