Juan's flat is better than I expected. There was no problem with the check-in as Stephan
met us on-time, welcomed us to the building and to the flat, and gave us a brief orientation. Everything's new and everything works. It's quite spacious for 3 people. My sister who traveled with us did not bother to pull out the sofa bed since she found the sofa comfortable enough to sleep in as it is. The mattress in the bedroom was also very comfortable. We all slept well throughout our stay. It's located in a quiet, non-touristy neighborhood about 15-20 minutes to Notre Dame, a straight walk along Rue Monge and Rue Lagrange. The nearest Metro is Cernier-Daubenton which is a few steps from the front door. There is a Franprix just around the corner and a nice Asian restaurant that sells hot food at all hours across the street (This restaurant appears to be a favorite among the locals as well) The best thing I like about the place is the courtyard entrance. It's the only one in the neighborhood which has this. Since it's on the third floor you have to be prepared to walk up the stairs (about 70 steps) with your luggage. The stairs have wooden floors so you have to step lightly so as not to disturb the neighbors. There are only about 9-10 flats in the building so we never met any neighbors which is just great for privacy. Will definitely recommend this place.