We stayed in Marcs apartment for one week with our two teenage daughters and it worked very well. Marc met us upon arrival and was very friendly and showed us the basics in the apartment.
The apartment is located in a very nice and lively area with lots of restaurants and local shops. There are two bedrooms each with a Queensize bed and a sleeping loft. The kitchen is quite small but has all kitchen-ware you need, exept for an owen. The TV is quite small but we never used it since there are better ways to spend evenings in Paris. Nice with two bathrooms (one with shower and the other with bathtub), the drain in the bathrooms had a bit of an odeur but was not a problem with the doors closed.
We closed the windows when going to sleep due to sound from below bars which made the bedrooms quite warm. After 2am the windows could be opened when the bars closed.
Hard to find a better position and place if you want to experience Paris.