It is a cute little studio indeed, nicely located. Thédore is a nice host, warm, welcoming and communicative.
The studio, althought tiny, has everything you need. Enough for a pleasant stay in Paris.
The studio is not new and the bed is a mattress on the ground but I slept perfectly fine.
As one would expect from an accommodation where smoking is allowed, the smell is definitely noticeable. Nothing dramatic but maybe good to know for some.
Hotels in the same area and price range definitely offer less comfort and privacy than Théodore's studio!