The space is amazing and as pictured. Clean & well appointed and the access to everything in Old Montreal could not be beat. We walked (happily) everywhere we needed to go and there are also the rental bikes all over the city.
As others have mentioned, you are in the thick of the night life. If uninterrupted sleep is super important to you, particularly on weekends (and you aren’t part of the night life that goes until about 3am) - staying in Old Montreal may not be the right fit. It won’t be just this space - it will be any space in the area.
The ad does indicate the space fits 4 guests but the 2nd bed is the couch that turns into a bed. Not super great for adults, but we made it work with our kids. That is the only “negative” I can come up with. We would return and absolutely recommend!