Quad rooms are very different from 4-person apartments or suites. Quad rooms are literally four people in one room, just as triples are 3 people in one room and doubles are 2 people in one room. There are also single rooms available--most of them are in Les Prince, but most residences have at least a few.
Bates has 2-person, 4-person and 6-person apartments. For the 2-person ones, I believe the two people have to share a room, but the 4-person and 6-person ones all get their own rooms.
I'm not entirely sure how the Keyes suites work, but I'd imagine it's the same.
These are the fees, from the housing website:
http://housing.mcmaster.ca/Residence...ions/Fees.html
All you have to do is google 'mcmaster housing' to find it...not that hard
The housing website should be able to answer any other questions you have about res.