This AirBnB is located in a boutique hotel, and is a very well-designed one-room that is located off of central Montreal. Note that the room itself is quite small, but it has all of the necessary amenities of a "full" AirBnB. We found the bathroom a bit cramped (my husband is 6'2!) but overall it wasn't a problem.
The street it is located on was a bit busy, and we were worried that we would get a lot of street noise but it turned out not to be a problem. The location is unbeatable -- steps away from Berri-UQAM Station, which will take you to nearly anywhere you want to go. It is also down the street from Jardin Gamelin, which had some very enjoyable street festivals.
We booked the AirBnB during Formula 1 grand prix weekend, and it was very expensive for the size of the place, so we could not say that the value was phenomenal. But all in all, it met our needs and we had a nice time.