We went for my daughter's 18th, taking my family and some of her girl friends. There were plenty of bedrooms, bathrooms etc. Really good keypads (2) that meant you felt really safe and the girls could access at will during the stay etc. The area has a lot of nice bars and restaurants at night, and during the day it's a short walk down to the Seine. We walked along to the Louvre, the pyramids, Arc de Triomphe etc. Really beautiful area. Girls enjoyed the local shopping too in the afternoon. Gilian was very helpful without being intrusive and gave us a great recommendation for dinner locally.
Couldn't recommend this place highly enough.