The location is great, I walked to downtown, old Montreal, and Chinatown easily during my stay. It's super close to a stop on the 747 bus which goes to/from the airport.
Check-in process is easy and doesn't require you to meet the host so that's convenient.
The pre-canned info the host gave was very complete and had everything I needed to check-in. I was able to check-in early after checking with the host which was not expected but appreciated since I was a few hours early.
Communication with the host was ok, very polite and helpful generally, but had to follow-up a few times to get answers for some things.
The wi-fi seems to be shared among a few units and I had some trouble with it being spotty.
The unit has an air conditioner but it's a stand-alone floor unit venting to the balcony door, which is also the only window, so you can't really open the window at all. The A/C unit is somewhat loud and you'll need it running most of the time.
The walls are pretty thing so your experience will depend completely on who else is staying around you. For most of my stay, it was very quiet which I definitely appreciate, but on the last day a family arrived a few units over, and I could hear them easily talking, moving dishes around, and especially slamming the apartment door, so again YMMV.
Overall pretty clean place especially the commonly used areas (couch, bed, bathroom, fridge), but a little dusty in the corners and crevices so just be aware if you have allergies.
Overall I think this place is a great value. It's spacious , comfortable, a prime location, self-service. I wouldn't hesitate to stay here again unless I wanted to be a completely different area of the city.