Antoine's studio est tres agréables! It is a studio, so the couch in the main room pulls out into a bed. I wish we could have enjoyed the private terrace more, but it was raining when we were there. The studio has a fully-equipped kitchen and the bathroom is relatively clean. The bathroom is a pretty tight space but that's not out of the ordinary for Europe. There is a ton of light and lots of interesting books (in French, of course).
The studio is located within an unassuming building behind a graffitied door. He lives on a main street in Belleville that is teeming with life at night thanks to all the Asian restaurants and bars nearby. He lives just a block away from the Belleville Metro station.
Because the studio is so compact, it's the perfect home base for people who spend most of the day out and about exploring the city, which you should do because after all, you're in Paris!