I stayed at Christine's house with my boyfriend and our expericence was great!
The house was clean and in a very good position (near two metro stations and a big supermarket), Christine was lovely and gave us some advices regarding the metro, restaurant and the "must see" of Paris.
In addition, she was willing to modify the date of our stay, and we had no problems in giving her back the keys of the apartment.
Such a lovely person and a great way to spend a few days in Paris!