I really had a great time staying in Matthieu house. Maybe it's the best part when I was in Paris.
The apartment is very clean and very close to metro station--less than 2 mimutes by walk. Besides, Matthieu is a very nice and interesting friend. He has travelled in many countries and know different cultures, which makes him open-minded and knowlegdeable. If you have no idea where you can visit in Paris, he can always give you some amazing recommendations. That helped me a lot.
I only stayed in Matthieu's apartment for 5 days, but I already felt it like my home. When I leave there, I felt like I was separating with my brother.
Personally highly recomend for this place and you won't be regret.