The appartment is really very nice and in a great location. Its ideal to get around the city, not centrally located, but we enjoyed that its really more quiet in this part of town. Out dog loved the park close by! The kitchen is equipped very well equipped. We spent some great days there with two of our kids and our dog. The appertament is ok for four, if you spend most of the day in the city anyway. You should know, that it is a very open appartment, i.e. no doors to the living room, sleeping room or bathroom (you go around the corner).
You should also not be afraid of steep climbs, as the stairs to the appartment are adventurously steep, which seems, however, to be quite common in Amsterdam.
Overall, its a really nice and quiet place, from where you can explore this wonderful town.