I expend 3 nights with my family in Christoph apartment, this apartment is very nice and have everything you need and more. For example, we lost the baby stroller in the airport, Christophe and Nathalie they save our live by lending us one stroller during the stay.
This apartment is next to everything you need, there is a super market at two blocks, 4 restaurants in the same block, pharmacy in the corner, bakery at 2 blocks. In addition, metro station “Volontaires” is at three blocks. Taxi from Eiffel tower to the apartment is not more that EUR$15(reasonable)
Access to the apartment is very easy with the dongle key; also, there is an elevator.
Communication with Christophe and Nathalie is very easy and fast answer.