Comfortable one room apartment in the city center very close to the Louvre, the Seine, bars, restaurants, grocery stores, bakeries, Starbucks and the metro as well as the RER train to the Charles-de-Gaulle airport (no switching trains - very convenient!). Five movie theatres are also within walking distance (<15mins).
The host was extremely welcoming and helpful with everything - I spoke French with her though, don't know how good her english is, so a little french would probably be helpful. She greeted us with the key when we arrived, explained everything. There was nothing we needed or were missing. She gave us helpful tips and answered all questions within minutes when we had any.
The apartment is exactly like shown on the pictures and very clean. It is on the 6th floor (111 steps or a tiny elevator for 2) and was thus very quiet although it really is in the middle of a busy area. We stayed for seven nights in December and we'd stay again any time!