My boyfriend and I stayed at this apartment for 3 nights. The apartment was as pictured. It was clean and tidy. Sophie communicated very well with us. She gave us step-by-step directions to the apartment from Gare de Lyon (which is about 5 minutes away, walking), she left us a printout of her expectations along with suggestions of restaurants and a market to try. Although Sophie was out of town while we were there, she had a friend meet us at the apartment to give us the key and to show us around. We were already on a late train and that train was delayed. Sophie's friend waited for us, even though it was very late.
The only improvement that we can suggest would be curtains. We were there during the hot part of the year and had the windows open as there is no AC (typical for the climate). There are other apartments across the street and we could see into their apartments, so I am certain they could see us too. Although we didn't notice any creepers, we would've enjoyed the privacy.
The bed is rather firm, but that is a matter of taste - we like a softer bed, some may like this firm one.
The WiFi provided works great, there is a washer, an iron and ironing board, and full kitchen for use. The apartment complex was quiet. It's close to 2 metro stations and Gare de Lyon. We enjoyed our stay.