My friends and I (five of us) were looking for a place in Paris, where we could check-in asap, after we'd had problems with a pre-booked hotel. After finding his listing, we emailed Charles and he responded immediately with answers to our questions, so that we could go ahead with the booking. He was considerate enough to let us into the apartment a little earlier than the check-in time, and also arranged for the room to be readied and cleaned before we checked-in.

Charles' apartment is in a charming building complex, very close to the Canal St. Martin. The living room and the bedroom get beautiful sun light throughout the day, and both rooms are tastefully decorated. We used the living room as a working space during the day, and even with five people working together in the same room it did not feel cramped. The wifi was fast, and all the other amenities were as described in the listing.

There are quite a few cafes and restaurants very close to the apartment. Given our short stay we could not explore as much we would've wanted to, but had some great meals at Le Cambodge and Cafe Clochette, and thoroughly enjoyed our short strolls by the Canal.
To sum up, I would definitely recommend staying at Charles', and spending some time exploring the Canal St. Martin neighborhood.