Antoine's flat is beautifully located in the 5th district of Paris. My wife, 3YO son, and I stayed here for just over two weeks to visit family and just enjoy the famous Latin Quarter.
Antoine had excellent communications from beginning to end. When we first booked our stay almost 7 months ago he was very responsive, and followed up within a few weeks from our check-in. He coordinated with us as we flew into Paris CDG, and met us on time to go over the apartment (as well as give tips about the current status - widespread strikes affecting public transport during this period).
The flat itself is extremely close to the Pantheon, with many bars and cafes nearby. It is also very close to the Sorbonne University, and thus the general area has a lively student population. Location for us really could not be better.
At 15 square meters, it is actually a little larger than we expected. The bedroom loft is excellent, and two skylights provide a nice ambience, providing ample sunlight. Foldable chairs and tables allow for flexible room usage. It is not dissimilar to being on a boat or RV. The kitchenette is serviceable, with electric stovetops and a toaster oven work well for us. Perhaps the only real downside is the bathroom, specifically the tiny shower. However, this is a small price to pay, and we had many guests visiting who commented positively, including a few who wanted to know if Antoine was interested in selling (?).
Overall, it was an excellent experience, and now we dream of possibly buying a similar apartment of our own, hopefully at least as good what Antoine has to offer.