A very nice & large (especially for Paris!) appartment and really well equipped! We stayed there with 3 adults, 1 toddler and a baby. The kids really enjoyed the children rooms with the toys and the bubble bath. I would recommant it!
We already knew the neighbourhood very well. It is close to Gare du Nord and Montmartre is on walking distance. It is directly situated next to a hectic metro station and bussy streets. Because of the new windows you don't here any noise of this.