Our family with three young boys (13,10,6) stayed for a week in Virginia's apartment this summer. It was one of the best vacation we have ever had! We live in a fairly rural area, so it was a big thrill for the boys to be able to walk to a corner store, the park or the YMCA pool (you can buy a pool pass for $5). The neighborhood felt very safe and we were surrounded by destinations for them to explore - everything from small markets and bakeries on Sherbrooke to Yumi sushi (where we ate three times!) to the bike path. Bring your bikes and you can safely ride a complete circuit around Montreal starting and ending one block away from the apartment.
Overall, this apartment was the perfect home base for our adventures. We had enough room for our family and the kitchen allowed us to cook at home, which cut the cost of our trip. And the location was beautiful. We will come back again!