Bon, je vais écrire en anglais pour tout le monde de comprendre (presque tout le monde je pense :P)

Felix was a nice host, really really considerate and caring. I spent a happy time in Paris with him and his roommate Édouard. They offered me tea and snacks as welcoming, and we also shared the meals. Staying with them, I had the opportunity to join some local social occasions and thus experienced a real Parisien life.
The room was clean, nicely arranged, full of really cool art decorations. I also love the bathroom a lot -- decorated with bright colors and a handful of artworks.
The apartment is situated perfectly in the center of Paris, right in front of metro station "Bon Nouvelle". It's convenient to go everywhere by metro, and in fact I walked all the time to most of the spots I wanted to go (things were not all in walkable distance but personally I love walking).
Felix gave me useful info about getting around in Paris. It was actually my 3rd time in Paris, so he perfectly recommended me some places I have to go as a 3rd-timer. He taught me French as well, hahahahah :D We talked about different cultures and shared our opinion on things happening around us. It was really a great time staying with the two!