Marc's place was great. Really well located and very clean. Montmarte is an easy walk away and was our favorite place in all Paris. Lot's of cobbled paths, nice little restaurants and cafes; a lot of character.
Marc was a great host, gave us very clear instructions for the flat and was very flexible with us. He also gave us some great tips for where to eat - which lead to some delicious meals. My only fault with the flat was that the bed was squeaky and not the comfiest. Otherwise it would have been 5*