Christelle's apartment is a wonderful Parisian authentic stay in the city of lights. Christelle is very welcoming, she was always available for any consultations, and even let us put the bags in hours before check-in.
The apartment was very nice, very clean, and is a great option for staying pretty close to the interesting parts of town.
Note that it is in the 4th floor with no elevator (doesn't get much more authentic than that).