Stayed at Aaron's place for my bachelor party and would recommend it for anyone looking to stay near downtown MTL! We were a 10 min walk from the Bell Centre, and many other local bars and restaurants. The place was in great condition, beds were comfortable, and we found it to be rather quiet just away from the downtown commotion.
I will say, as the only concern if you are a larger person like myself and some of my friends, we did find it rather tight for 7 of us. Personally I'd say it comfortably sleeps 5. The sofa beds are comfortable, and the beds were great. But not quite as luxurious when you have to share!
All in all, highly recommended! Perhaps the best thing of all is Aaron himself. Responds to any question instantly, always friendly and very helpful!