Thanks, Grace! It was only a short stay, but Grace made all go very smooth.
Pros: The location is literally 50m from a tube station, so transport is easy. Further the area is very lively with plenty (and I mean PLENTY!) of places to eat a very large variety of foods. If you are going downtown or to the Concordia or McGill Universities, it's all within walking distance. The flat is shared, but I didn't cross the other guest, and in any case, your room and bathroom are totally separated. For coffee-adicts, Starbucks also just about 100m, or if you like something more chic, the coffee from the chocolate shop around the corner over St. Catherine is great. Room is cozy and has everything you might need for a short stay; in addition to the bed and wardrobe, there is a desk to work, wi-fi internet works perfect for e-mail and webbrowsing, and plenty of light enters through the two windows (with shades for privacy). Absolutely silent!
Cons: Third floor, stairs only. Water pressure is tolerable but not brilliant.