Cheapest accomodation in Montreal

[zemus]

Putting aside hostels, what is the cheapest accomodation possible that one could find in Montreal?

My girlfriend (who is English) is coming to Montreal to visit me for 6 months, and she is looking for the cheapest logding here that isn't a hostel, a hotel or somebody's couch (there are many reasons for this).

Any suggestions (e.g. student dorm rooms)?

Thanks in advance!