For the location in Paris, this is very good value. Kitchen and bathroom setup are a little makeshift, but it is a studio, and it has the charm and great lighting of a beautiful studio space. Other pluses - very comfortable bed, an iMac computer and WiFi, charming courtyard, overall very clean, quality used furniture. Level of noise from upstairs is significant in the evening.
But overall, to reiterate, if you don't mind amenities being a little rough, I think a place like this in this kind of Paris neighbourhood, at this price, really is great value.