Romain was wonderful, he gave me all the directions and everything I needed to know. Even after I arrived and I think he was about to go on holiday, he answered my each question (and there were many) in a timely manner.
The location of the house is excellent, in terms of both metro/train/bus connection and the liveliness of Rue Montorgueil. I went so easily whether on foot or by train. The street has many bakeries, markets, cafes and groceries where you can buy your baguette and cheese and have your breakfast at home. I usually dined in Rue Montorgueil, the cafes all have outdoor seats and it's very entertaining to watch the street crowd in the evenings. It's very French, not very touristy, which is something I like.
The house is very very clean and neat, you have everything you need, but hidden away somewhere convenient. The apartment felt really safe, with several doors outside and really decent looking neighbors and it was also very quiet at night. The only downside is you don't see much sun, but the heater works very well in cool days and you don't need to sit at home when you can hang out in the cafes 2 steps away. I would recommend staying at Romain's house, however, since it is really small, I would recommend it for 1 or 2 people. I would definitely love to stay here again.