The apartment is beautiful, very clean and comfortable. Also it is very well equipped (e.g. very good WIFI connection, hairdryer etc.).
Just in front of the house stops a bus which brings you directly to the city centre (Louvre, Saint Germain de Prais etc.), the metro station is also just about a 7 min walk away. The area Montmartre itself is very nice as well and you can easily walk to Sacre Coeur.
Pierre, the host, is very kind and replies instantly. We really enjoyed our trip and we would definitely book this apartment again!! I can totally recommend it :)