I stayed at Mathilda's AirBnb for one night. I was with many other students travelling from San Francisco to Paris and we decided to stay here vs staying at a hostel. I'd have to say it was a good decision. The unit had 5 bedrooms, 2 pull out beds, and 2 single roll away beds--more than enough for a big group. The place was clean and easy to use. The only issue we ran into was trying to open the door that goes from the street to the mail area of the apartment building. After waiting for Mathilda's response (via Airbnb messaging), she told us we had to literally kick the door for it to open. Sure enough, it worked! So, if you plan to stay here, just make sure you push that door and you'll be right in.
Another observation I had was that there was no "Welcome" area. Other places I've stayed in, there was a "Welcome" book that had important things like wi-fi password, special instructions, etc. This wasn't too much of an issue, but it could be helpful for future guests of this AirBnb.

Aside from that, Mathilda was a great host! She was fairly quick to respond to my questions and willing to help. Would definitely stay here again! (If I ever need another place to stay in Paris that accommodates 10-15 people.)