This location is perfect for a short-term stay like ours. The check-in was a little tricky due to ongoing construction nearby at the Hotel de Ville, which has changed parking and traffic patterns, something the hosts didn't communicate. But noise and other inconveniences from this are minimal. You just may want to park at their recommended garage (3 days, $39CAD) and offload your car.
The unit was immaculately clean. The building has an elevator. It is in the middle of the city, with key sites less than a five-minute walk away. Even at the location, the ambient noise is minimal, though if you are a light sleeper you may want to bring a couple of ear plugs for early-morning traffic from the construction vehicles down the street. The building itself is quiet and we were left under the impression that we were the only people in the building. We did stay Sunday to Wednesday.
Another note is the building does have a tourism seal, and it leads me to believe the building is only for short-term AirBnB stays. As such, the unit is equipped with a commercial refrigeration unit, and so therefore there is no freezer, or freezer chest. I don't think it would have changed our decision to stay, but it would've been nice to know as even AirBnB's logo for refrigerator includes a freezer.
Finally, the hosts were very communicative. They responded quickly to questions and concerns. They gave a list of nearby restaurants and where other services were. They recommend a local market, and by all means use this market as it was surprisingly affordable. We never met the hosts, but we would stay again if we were visiting Quebec again. You can't beat the location, and the clean unit, and the value versus other AirBnBs and surrounding hotels made it great for us.