Mathieu is a fantastic host! His place is lovely and in a fantastic location. He gave us some great restaurant and walking recommendations. Also he writes back quickly and proactively about everything.
One thing to note - we aren't smokers and we noticed that Mathieu's apartment smelled of smoke. After 5 minutes we didn't notice it anymore, but we could smell it each time we entered the apartment. Mathieu was lovely about it and offered to reimburse us for candles or air freshener (very sweet!) but we didn't need to buy those in the end.
Thanks for a lovely stay in Paris Mathieu!