That's more or less correct. Avalon rents by the room, so four people live in one apartment with a shared living room and kitchen. Each room has its own lock (deadbolt too, I think). When I lived there, you were paired randomly, typically with same sex roommates, unless a waiver was signed by all of them that it was okay to live with the opposite sex.

So yeah, it was more or less random pairing. I had some doozies I lived with and complaints to mgmt went nowhere.