Pros:
-- Jean-Claude is a very friendly, flexible, and responsive host and was always a pleasure to deal with.
-- The apartment itself is HUGE, airy, and light filled and not only much larger, but also much more unique, than anything else you're likely to find anywhere in Paris (or in most of Europe for that matter).
-- The location is amazing, with the apartment set on a very quiet and secluded private street that can only be accessed via two code-locked gates. And while it feels like you're staying in your own little oasis, once you step outside on the main street you're incredibly close to everything (multiple metro stops, Republique, tons of great art galleries, boutiques, bars and restaurants -- including both HolyBelly locations, which are an absolute must-stop for brunch and only about a 3-minute walk from the apartment).
(Small) Cons:
-- As is the case with many places in Paris, there is no AC, so depending on the weather/season it can get uncomfortably warm (though there are plenty of windows that can be opened for circulation).
-- WiFi mostly worked, but was spotty at best.
-- Due to the open nature of the apartment, it lacks a bit in privacy. So you'll want to make sure you're very comfortable with any other guests who share the apartment with you.
-- In some regards, the experience felt more like staying at a friend's apartment who happened to be out of town, rather than staying in an apartment specifically designed to host guests (multiple lights didn't work, there were no towels in the downstairs bathroom upon arrival, multiple soap dispensers were empty, sponges, mops, and other cleaning supplies were left out).
All in all, we really enjoyed our stay and would highly recommend it to anyone looking for a super unique and spacious place to stay in the heart of Paris. And with a few small improvements, this could easily be one of the top AirBnBs anywhere in the world.
Thanks Jean-Claude!