My stay in Arnaud's apartment was just amazing! The apartment is just as it is shown on the pictures, great design, furniture, all appliances. Bathroom is spacios and new. Bed very comfortable. Windows face 2 sides of the building, which allows for great ventilation. Kitchen even had coffee machine, and Arnaud left some coffee for us. (I stayed there with my mom).
Arnaud was very hospitable and allowed me to check-in 2 hours prior to agreed time (I had slight changes in my arrival time to Paris), and more importantly allowed us to stay in the apartment till 9pm on the departure date, which spared me from the necessity to look for lockers in Gare de Lyon or elsewhere.
He helped me and my mother with the luggage (the apartment is on the 2nd floor of the building without elevator), which was a great help!
Besides, I was really touched by Arnaud's punctuality - he came minute-in-minute for both check-in and check-out.
The location of the place is great as well - you have a small supermarket and a great bakery steps away, a larger supermarket 5 mins away, lots of restaurants, brasseries, bars, pharmacies all around. Metro is 2 mins away and is very convenient for any trips around the city. Besides, you can always walk 5 mins more and take other lines.
Overall, a wonderful experience both for the apartment itself and the host. Unfortunately, we were both a bit hurrying and did not have a chance to chat, but maybe next time :)

I hope to stay there next time I am in Paris.