We booked the penthouse(7th floor) for a party of 9 and would highly recommend it. The views of the Eiffel tower from the apartment are stunning and as you are locating in central Paris the major tourist attractions and restaurants are easily accessible.
The staff at the reception were very friendly and helpful and a special mention to Alexis who answered many of the queries we had before we made the trip to Paris.
He also sent us a very helpful guide for the apartment and the surrounding area.
The apartment was clean,well equipped and spacious. There was wifi, which the kids were delighted with, but certain rooms in particular the room with the double bed and ensuite bathroom you could not connect to the wifi. Minor quibble was that the single beds could have been bigger and were a touch too small for the adults.
Overall however, and stated above, I would highly recommend the apartment and the location.