We really enjoyed our stay in this apartment.
Flat is localized not far form the city center and it's very easy to get there. Nearby metro station, supermarket and a few restaurants. Room is cozy and light, you can see the top of Sacre Coeur from the balcony. The great advantage is that you can use almost everything you find in the kitchen. Big livingroom gives you a place to eat meals and chat with flatmates. We felt like at home. The only disadvantage is that if you want to go to the bathroom you have to walk through one of the flatmates' room.
Marco is a great host. He's been very helpful, always replied to our messages quickly and has given us all important tips we needed to travel ably.