We just spent 1 week in Christophe's new apartment. There were 4 adults and 2 children (3.5 and 18 months). Prior to booking this place we were very close to booking a hotel on the Champs Elysee, but this apartment was a better value, with significantly more space. The apartment is brand new and Christophe has really done it up well. The beds are incredibly comfortable - one excellent feature is the small room that has the fold out bed - we put our 18 month old in this room using the provided pack-n-play cot/crib, and he slept restfully here.
The location is fantastic - out the door, 200M walk, and you're at the Eiffel Tower. Out and turn left and walk a few hundred meters and you have all kinds of charming restaurants, cafes etc. We spent the first night just roaming around and getting the feel of the city.
Christophe is very responsive and was always just a text message away. He met us at check in which went very smoothly.
Overall an excellent experience and stay with a great host.