If you want to get a nice local Parisian experience, Marc's place is great. Here are pros and 1 issue.
Pros:
You are across the street to Paris' oldest market with fantastics food stores
Lots of great restaurants
Easy public transport
Few tourists milling around
Unique home. You are on the backside of a larger apartment complex and have access to a nice courtyard.
Marc, the Host, is very responsive and helpful.
We did have an issue during the stay with the air condition. Summers in Paris can be hot and this was something important to us. This was an important amenity for us and unfortunately they didn't work (loud and did not cool down the room). Unfortunately we were also in Paris during a heat spell (when we really needed the air condition).
Marc did try to contact someone to fix, but they were unavailable until after our check out. He did get his caretaker to try and clean the filters but this unfortunately did not fix the problem.