My wife and I love Paris and were taking our two daughters for the first time, ages 14 and 9. Camille's apartment was perfect for a family trip. There are two bedrooms, as well as a pull out couch (although our girls shared a bed and slept comfortably together in one of the bedrooms). There is a spacious, warm living room where we could all convene in the mornings and after a long day exploring the city. Having a comfortable place to gather made the place feel like a real home base, which for us was essential. Camille also had a fancy sound speaker available for our use, which is an excellent detail: having your own music and soundtrack for your adventures makes a difference. Finally, the place has wifi that I initially clocked at over 100 MB down and 75 MB up. That is just smoking fast. When you have two kids winding down after action-packed days, having great internet is amazing (my eldest FaceTimed her friends every night on the trip and shared her experiences).
The neighborhood: It's worth noting that her apartment is in an excellently maintained beautiful old building, a wonderful experience in and of itself. It's three flights of stairs to walk up, but there's also a tiny, very French elevator. Having visited other apartments in the city, it is extremely quiet and extremely clean in comparison. The Metro, Saint-Francois Xavier is a block away. There is a fantastic boulangerie on the corner, meaning morning coffee and excellent bread and pastries are just a few steps away. We spent most of our time in Le Marais, which is on the other side of town. But after a day of contending with crowds (museum lines everywhere, Le Marais, Latin Quarter, shopping at St. Germain des Pres), going home to a much less densely populated area was very welcome. The streets were empty after business hours. Something to keep in mind.
Camille was on holiday while we were there, but her friend Nina met us to let us in (on Christmas morning, no less!). Regardless, Camille was easy to get a hold of and answered questions more than once.
If you are interested in a place that works for a family, is clean and quiet, has wonderful character, and has the essential amenities not far away, then you should really consider Camille's place in the Seventh. For us, it was a big part of an amazing trip.