Wow! This is probably one of the best Airbnb spots that I've stayed in Paris. It's super cozy and comfortable. Matthieu was an absolute angel when it came to providing me and my friend information about the neighborhood. He was very communicative and accommodating. We were going to check out a little later than expected, and he offered to hold our luggage at his apartment (down the hall) while we explored the city a little more. Luckily, it didn't come to that, but the offer was greatly appreciated.
The bed/loft is a little wonky and takes some getting used to, but the bed is really comfortable. The floor to ceiling windows make waking up in the mornings great. The apartment is located right on top of the Belleville metro stop, so it made getting around the city really easy. There are a lot of food options including non-french cuisine right in the neighborhood, so you have plenty of options if you don't want to venture far from the AirBNB. Our first night there, we went to Le Floreal (Get the Calamari the sauce they serve with it is incredible). Everything was super walkable. I would definitely stay here again.