Claire's apartment is a really cozy place in a lively up-and-coming neighborhood. The apartment is particularly great for families with kids (my 3 year old son love the lofted bed). We were also able to move some beds around to comfortably sleep 2 adult couples, and one kiddo.
The neighborhood is definitely still in transition, but has a ton of young parisians all over the place having a great time. It's a bit of a hike to the classic tourist areas, but has a couple metro lines within striking distance. The Parc des Buttes-Chaumont is a really incredible park, and was completely full of life during the summer. It was a stunning place to have an evening picnic and pretend to be from "around here".