I had a great stay! Everything is as advertised. The apartment was clean, stylish, and I really enjoyed the balcony. All amenities are available. Both Jean Luc and Zakia (who met me at the apartment to let me in and show me around) were very responsive to messages leading up to check in.
As others have noted, there is a 5-story climb up a fairly steep staircase, which was not an issue for me, but could be problematic for those who may have mobility or health issues.
The apartment is a little ways from some of the prime tourist attractions (Eiffel Tower, Louvre, etc), but it is very convenient to the Metro which makes it easy to reach any landmark in the city. The commute was no issue for me. And, the value is great as it seems comparable places closer to the tourist center can be more expensive.
Overall, I had a fantastic stay and would highly recommend Jean Luc’s apartment! I would happily stay here again.