I stayed at Marc's place for 7 nights.
First of all, his flat was cool and always very clean. The bed room had a closet and a desk, which was quite convenient. The location was also good. It is a 5 minutes walk from the metro station, and there are a bakery, supermarkets, and other shops in the neighborhood.
Marc is a very kind person and helped me really a lot not only with daily life but also with tourism. He knows surprisingly well about streets, buildings, people, histories, and siteseeing spots in Paris. He gave me many suggestions about where and how to visit, and sometimes showed me around interesting places with great explanations.
I really enjoyed spending time with him. He made my stay even more fun than I expected.
I highly recommend Marc as an excellent host to everyone.