There's a reason that your host, Greg, and this apartment have consistent 5 stars. The communication with Greg prior and during our stay was fantastic and we were thrilled to get to meet him right before leaving to return home. He clearly cares that his guests have everything that they need and enjoy their time in Paris.
While the apartment is small (compared to my American standards) it was perfectly sized for my fiancé and me. We found the apartment to be spotlessly clean, the bed to be comfortable (absolutely necessary for a 7 night stay) and enjoyed several evenings cooking dinner and hanging out in the living room. It's located close to many of the tourist sites (several blocks from the Louvre and Palais Garnier) but far enough away to find amazing, local restaurants and in a quiet side street where we didn't hear any traffic noise. We were able to walk everywhere and enjoyed hitting up a number of Greg's suggested spots - we hit up his recommended boulangerie 5 times!
The apartment had everything we needed for a longer stay (washing machine, dish washer, blow dryer) and even included some staples in the kitchen (coffee, tea, salt, pepper, etc) which we haven't found to be common at our other AirBnB stays. If you're looking for a nice, quiet spot in a fantastic location - this is it!