My wife and I spent seven nights in Sophie's apartment and it was a wonderful experience.
The apartment is exactly as shown in the pictures, although the pictures do not do justice to the experience of walking into such a nice place. The apartment has a fantastic view of the Seine, with lovely large windows, and provides an extraordinary amount of space for central Paris. The apartment was spotlessly clean, the bathroom is modern and spacious, and the kitchen provides everything you will need for your stay should you choose to cook rather than visit the very nice restaurants in the area.
The location is very convenient. The apartment is centrally located for both the Left and Right banks and most of the big tourist spots, but provides a quiet and residential neighborhood for a restful night's sleep. There are several metro stops within easy walking distance.
Sophie as a host could not have been nicer. She was very responsive before the trip, gave us a thorough briefing on the apartment and area, and graciously provided basic food stuffs (bread, fruit, coffee) to get us going.
We thoroughly recommend this apartment and would definitely stay here again when we return to Paris.