Had a fantastic holiday, really lovely home, with lots of shops and bars locally, and minutes from Sacré-Coeur Basilica. We mostly walked round Paris it was 40 mins to the Louvre.
Area is on a steep hill which meant having a pram was harder, but manageable. Also with younger children if you want eat out locally in a Brasserie probably best to get out early as Monmartre is busy with young adults, though there are also lots of pizza places, but other than that was a great place to stay.