Gerard and Nicole's place is fantastic.Nicole is a very gracious person who answered all my inquiries almost immediately. The apartment has an unbeatable location within easy walking distance of a metro stop. It is also quite easy to walk to many of the iconic Paris sites (the Eiffel tower is about 1km away, for example). There are many restaurants, cafe's and bakeries nearby. There is a major grocery store almost contiguous to the property. The apartment itself is clean, has pretty good internet, all needed appliances, excellent bathrooms and beautiful paintings and artwork. The view is simply awesome as you are high up -- 27th floor, I think-- and can see the nearby Eiffel tower and be treated to a beautiful view of Paris.
The one drawback, and it wasn't that serious for us, is the second bedroom is really not a bedroom as it only has a pullout couch (and no closets). It would be perfect for a couple with children but for two adult couples it is a bit tight. The pullout couch is comfortable enough, especially if you are thin, but once pulled out there is no room to maneuver around it. Still, I would go back in a heartbeat because of all the many advantages the place offers.