I stayed at Marc’s place for a week and a half and had a great experience. The apartment is exactly as pictured and I had no complaints about space; it was perfect for one person. The apartment faces an inner courtyard so is decently protected from street noise but you do hear people entering and exiting the courtyard. This also helps keep the apartment from getting too hot; I was in Paris during the 105 degree heatwave and the apartment was great to come home to after a very hot day out. During my stay, I made use of the washing machine and drying rack, which was very convenient.
The apartment’s location was exactly what I wanted: 1 minute from the 5 at Oberkampf, 2 minutes from the 8 at Filles du Calvaire, close to my favorite restaurants and bars. Walking, it was an hour to the Musée d’Orsay area, 10 minutes to the Canal St-Martin, 15 minutes to le Marais, and 25 minutes to Bastille.
Finally, Marc was very responsive the whole time. I would definitely stay again!