I would, with caveats, recommend this studio. I spent a month here, and appreciated the location, kitchen, and space. It was also very nice to be met by Benoît with some essentials on my arrival.
The road is quite noisy (more so at the weekend), so I'd recommend bringing earplugs if you are a light sleeper. The sofa bed is easy to set up, and is ok. For an old building, the plumbing was mostly ok.
As long as you're not expecting a hotel, none of the above should be considered deal-breakers. For Paris, this is a fairly good studio.