Antoine's flat is a wonderful little loft in a great area: Just a few steps from the Panthéon and the Jardin du Luxembourg and 15 minutes' walk from Ile de la Cité. There are tons of bakeries nearby where we got croissants every morning; there are also excellent cheese and charcuterie shops and quite a few nice restaurants and bars within walking distance.
The apartment itself is super cosy and nicely decorated. The bed is very comfortable and the huge windows let in a lot of light. Even though the flat is located on the ground floor, passers-by are prevented from seeing the interior thanks to the cleverly placed opaque strips on the windows; and in the evening, you can simply close the huge wooden shutters for some privacy.
The kitchen is stocked with all the essentials (cutlery, glasses, plates, pots etc.), with two hot plates allowing you to cook basic meals, which was very nice for when we were too tired to go out after a day of exploring museums and cathedrals. Most importantly, it has a kettle and a coffee machine - the latter being essential for when you want to make it to the Louvre as early as possible ;D
Antoine himself is a brilliant host. He gave us excellent tips and recommendations and kept us updated on when the flat would be ready for us to check in. He usually replied to questions within a few hours at most (sometimes even within minutes) and was extremely helpful, communicative and friendly.
All in all, we can only recommend Antoine's flat as a cosy home base for exploring this beautiful city, and would definitely consider coming back in the future!