We really enjoyed our stay at the flat. The best thing was the location: very central, near the metro and bus and within walking distance of many tourist sites. There are bakeries, restaurants and shops right on its doorstep.
Typically for Paris, the living space is tiny but the flat has a smart design that makes good use of every square metre. We found it well equipped and didn't mind all the stairs.
Emmanuel is a great host, who replies to email messages promptly and has a convenient arrangement in place for retrieving/dropping the key.