Well presented place. Very convenient location and close to two metro stations (Renne and St Sulpice). Two grocery stores nearby. Having the washing machine and dryer was very convenient.
On the downside, the place does have faint mouldy smell. Really not sure where it is coming from because the place does look quite clean. It is most obvious when returning from a day out and the windows have been closed the entire day. Once the air is allowed to circulate, the smell is not noticeable. With two large windows, getting the air to circulate quickly is usually not a problem.
Unfortunately the place is on the ground floor and windows are facing the outside pavement, so people walking past can look inside. There are curtains in place, but if you want to circulate the air quickly, you'll have to put up this lack of privacy.
Also at night, there were a few instances of people peeing on the pavement outside the window - which is not too far from the window, and was rather unpleasant when we were sleeping in bed. Otherwise during the night it is reasonably quiet.
The studio apartment I think is reasonably large by Parisian standard. I have stayed at places easily less than half the size of this place.
Overall, I do like the place, and would consider staying there again. Great location and great amenity.