Overall the place was very clean and the listing pretty accurate. The place is tiny and with only stools to sit on so not a place to relax. Its really good as a place to sleep at when doing intense site seeing, especially outside of the summer season. With that said, it was difficult communicating with the owner as he was not super responsive. I had to race over to get the keys earlier than the planned check in time and it was very stressful - not to mention that the woman that presented me with the keys spoke zero English. There was no wifi which to me is a must these days.
Most problematic for me was the location. So while it was in a nice area in Montparnasse, near cafes and the metro, it was actually too close to the cafes being so near the key traffic circle in the area (with all the cafes) and on the second floor, you could hear everything with the windows opened. I couldn't fall asleep for a few hours some nights due to the noise outside. This was in the summer with a heatwave so open windows were necessary. Then on Saturday morning at about 6am there were people making noise setting up for an outdoor market.
I think the unit would be much better outside of the summer season when you can close the windows.