I'm sorry, but I've just read your current version and it still feels like an odd fit for the site. Are you looking for feedback and validation on your chosen method of sorting roommates? Are you asking how people would usually do that sort of thing?
Am I doing this right?
Isn't really a great format for SE, because it lends itself to rather opinion based yes/no answers rather than more focused-longer answers backed by research or experience.
Asking us to help you word an advert probably isn't going to go well either.
It may be better to be specific about what sort of boundaries you're looking to set and ask people about how to explain these boundaries to potential roommates in an interview process.