We really enjoyed our stay here for three nights.
Christophe was easy to deal with and left a good brochure for information.
Area was next to Rue de Montorguiel which is good for bars / restaurants. There were also metro stations close by.
Flat isn't right next to the main attractions, but it's not difficult to navigate so this wasn't any concern to us. Notre Dame was probably about a fifteen minute walk as a guide. With Google maps etc though you can figure out whether the location is right for you. Overall, the area has everything you need. Although near bars etc, below the flat are clothes shops which means there's no noise at night.
The actual flat itself was excellent. The entrance is in a communal close. Stairs to the flat were a bit angled which felt eccentric when leaving / returning but the flat itself more than makes up for any concern here.
Overall, considering price versus the location and standard of the apartment I would definitely recommend the flat. The large living area and kitchen / dining area were special plus points.