Mario and Camille's place is fantastically located—right next to a major train and metro station and super walkable to all the main attractions (the Louvre is about 20 minutes, Pompidou is right behind). Despite the central location, the apartment itself is very quiet and peaceful. You essentially have a hallway to yourself with this room, so it feels very private. The place is stocked with thoughtful touches, like two charging cubes with USB outlets, so you never even have to break out a converter. They also have a coffee and tea station in the kitchen. I didn't see much of Mario and Camille, but when I did, they were always friendly and had great recommendations.