I stayed in the apartment as part of a family trip to Paris (2 adults -two moms- and 6 kids).
LOCATION: The apartment is in a fantastic location downtown. A 10 minute walk to Louvre, 10-15 minute walk to Opera House/Lafayette Galleries. Very safe area, with plenty of bakeries, coffee shops, restaurants, and grocery stores around. Yet, quiet enough at night to sleep.
COMMUNICATION: Communication was quick and effective all through our stay. We had some minor misunderstandings about access codes but everything was quickly solved.
APARTMENT: Apartment is renovated and very clean (which was appreciated!). Fairly spacious for Paris and for a larger family. It has functional windows back and front, and in both bedrooms. Apartment can accommodate up to 8 people (we were 8). Has 2 sofa beds (one of them has a nice, firm mattress; second sofa bed has a thinner, softer one). Access to both showers is only via bedrooms --it did not bother us as we were family, but it is something you may want to keep in mind if you are traveling as a group of friends.
The apartment does not have air conditioning (2 fans are available), also something to keep in mind if you travel in the summer time (we got the heat-wave of the year).
Kitchen is equipped with all utensils necessary for a quick meal or breakfast (wine opener included).
Bathrooms had towels, soap and shampoo, enough for all 8 guests.
Bedding for the sofa beds did not have cover sheets. Only bottom sheet and a thick comforter for cover (not for summer sleep).
The water heater is in one of the bedrooms and it gets very hot to the touch when people shower (careful if you travel with small kids, as they can get burnt).
Check-in time was an strict 4:00pm (although I believe it said 3:00pm on apartment posting).
All in all, it was a good, comfortable stay at an unbeatable location, and I would definitely recommend the apartment to families with the observations noted above.