The apartment is clean, comfortable, and located right across the street from the Louvre. When you walk up the Louvre-Rivoli station steps, you're literally standing at the crosswalk that lead's to the building's front door. Bus and metro connections were great. For major RER trains to Disney and the airport, it was just a 4-5 block walk to a very big station, or a one-stop ride from Rivoli.
It would be a little tight for four people, but for our immediate family it worked very well. Paris was slightly hotter than typical during our stay and the apartment wasn't cooled. We left the doors open at night and ran the fans which made the temp OK, but the traffic was then kind of loud. We're heavy sleepers, so this was no problem, but a light sleeper might have a problem.
I would stay there again.