My sisters and I stayed in Mathieu's place for a week in early August. The space was great for the 3 of us. Very clean and tidy, the aircon was a lifesaver and the location was amazing - super close to cafes, bars, small markets as well as 5+ Bixi bike stations.
We had a small issue that Mathieu and his team resolved quickly with no bother, and he was very responsive and accommodating throughout our whole stay. I wouldn't hesitate to stay here again and will be recommending it to anyone I know who's visiting Montreal!