An excellent apartment, in a wonderful neighborhood, with a great host. Since the other reviews are uniformly outstanding, I'll only comment in detail on a few aspects that are harder to glean from the listing:
The host
Daniel is hospitable and charming. He met us at our convenience when we arrived and stored our luggage for us after our morning checkout but before our evening flight. His recommendations for the neighborhood were great.
The apartment
The photos are accurate, but don’t sufficiently capture the beauty of: the ornate molding on the ceiling, gorgeous hardwood floors, traditional doors to the balcony, lovely stone counters, or original art.
The location
The apartment is in a hip, newly-gentrified neighborhood with great food. To get a rough feel for it, navigate to the “Porte Saint-Denis” monument on Google Maps; click on the street immediately to the monument’s north, Rue du Fauborg-Saint-Denis; click on Google street view; and “walk” north, away from the monument, by click repeatedly up the street. Know that these photos don’t do it justice—it feels nicer in person. We felt like we were in “real” Paris.