The apartment is located in an older, walk-up building along with a couple of other AirBnB apartments. I had no issue with noise from the other apartments. There is quite a bit of vehicular street noise but ear plugs solved that problem.
The apartment is very clean and is located close to lots of restaurants and bars and close walking distance to many attractions in central Montreal. The host communication was excellent and very well-detailed. A parking pass is provided free of charge for a parking lot 1/2 block away.