The place was great for a group of 4! The good stuff: A walk away from a lot of great places to visit in Montreal. 10 min walk or less to St.denis and Mont-Royal Metro. The place was spacious, high ceilings, beautiful view, big kitchen with lots of supplies, big bathroom, laundry machine and beautiful big back yard with bbq. The beds were comfortable.
The not so great stuff: Parking can be tricky, the street has free parking but theres not always a space to park. Also as Dany mentions, READ THE SIGNS.. On wednesdays afternoon there's no parking. I ended up getting a $60 ticket :(
As for privacy and quiet, out of all the sleeping spots, there's only one enclosed bedroom with a door. The other beds are closed off with curtains. One of the beds is located in the hallway which is the only route to the washroom from the living room where the other 2 beds are. That being said, the bed wouldn't be ideal for light sleepers. The walls are thin, like most flats in Montreal, and being on the ground floor you can sometimes hear the neighbours upstairs.
Overall I would definitely stay here again, we felt at home!