The apartment is in a busy area, but it was quiet at night for sleeping. We did not have a car and chose the apartment largely because of its location in Le Plateau. There are several excellent restaurants within a 10 minute walk, including a famous bagel place right across the street. It was perhaps a 10 minute walk to the subway (the same line as the old port / little Italy). So the central location made it easy to go places. This is an excellent place to stay if you want the feel of a Montreal neighborhood (and more the French side of town) - which is what we were going for.
The apartment itself worked out great for our family of four (two teens). It had a full on kitchen and living room, lots of sleeping options, two bathrooms, laundry, etc. This made it easy for us to stay several days.