We spend 8 nights in the AirBnB and enjoyed the stay a lot. It was very quite, clean and had all necessary amenities for our stay.
There was a minor issue which required fixing prior to our arrival, which is why we also met the very kind and helpful team on premise.
In addition to that is the place very well located between different subway stations, which gives access to three out of four lines (the major three to my mind). Nevertheless, we only used the subway to get to the suburbs, because everything else is close by and in walking distance (old harbour, old town, Mont Royal, China Town, Nôtre Dame, CBD, etc.). Grocery stores, cafés and restaurants are all available in walking distance as well. Additionally, the 747 bus line for the airport commute stops just around the corner (make sure to get tickets for 11 CAD in advance or have coins to purchase these on the bus).
Communication with the hosts was always very kind, quick and helpful.
Definitely recommend staying in the AirBnB for a sightseeing trip in Montreal.