Apt is 5 mins walk to Line 9 saint-ambrose station - very convenient! Its located along an alleyway, opposite a small bar so there is enough activity at night when its dark that the place feels safe.
Do take note that there is a flight of stairs leading up to the first floor but we didnt have too much trouble with getting our luggages up and down as the stairs are pretty wide.
We had some trouble opening the door but a quick google search taught us the trick to opening doors in paris - on your last turn before you hit the end, pull the door towards you and push as you turn the key completely.
Apt was really spacious with essential amenities - hot water, washing machine, oven, stove. Even with the heater, the apt was a little chilly so just rmb your fuzzy socks if you are staying during the cold weather.
Host was very responsive and helpful with local tips!