The studio is just like the pictures. It's very comfy for 1-2 persons.
It's on the 3rd floor though, so if you have heavy luggage it's a hard task getting everything up, since there is only a round staircase.
There was a heat wave the days I've been there, temperatures would get as high as 38ºC, and it was pretty hot in the room.
Despite that, everything was alright, Kylliki was really nice and easy to contact and gardienne Dina, who lives downstairs, is such a lovely Portuguese speaker person!
It's located in a nice neighborhood, markets all around, 10 min walking from Salpetriere, 20 min from Notre Dame. For the other main sightseeings it's further, but the metro is close by.