Charles' flat is simple perfect. The location is great, in the middle of Montmartre and very close to two metro station, which will make your visit to Paris very easy. The neighborhood is full of nice bars and bistrot, there's a supermarket just around the corner and everything you can need. The house is cosy, very comfortable and clean which makes you feel like at home. Charles was very nice, the communication with him was easy and he even left us some welcome chocolate beside all the necessary information to visit Paris.
I would definitively come back to Charles' flat when back in Paris!