Great place! We stayed with a family of 4, with kids of 5 and 9 years old. The location is excellent: 5-10 minutes from different metro stations (the 9, 2 lines, and C), supermarkets within a block, nice restaurants (French, Libanese, sushi etc). The apartment has a modern look. The space is not very large (as you can expect from a Paris city center-location), but the main room still feels spacious, and it was well-doable with the 4 of us. All rooms are connected, so you can hear each other in the different rooms quite well. We found some nice toys, plus a large TV and good-quality wifi; also, several playgrounds in walking distance. All in all, the kids were happy :)
Laurence prepared everything to perfection: the arrival, the snacks and drinks that we found, the perfectly clean apartment, quick responses to our questions. This was a great place for spending a mid-week in Paris!