Daniela's place has the essentials and is in a great location is your staying for a short period of time. My boyfriend and I stayed here for one night and had a great experience.
The flat is exactly as shown at the top of a very old building. There is no lift, but we were aware of that before booking. If you have trouble with small winding stairs, don't book! Otherwise, there is no problem at all. It was very clean and in the center of tons of restaurants, pharmacies and souvenir shops. The station to and from the airport is only a short walk away. We were able to walk to the Louvre and Notre Dam easily but the metro is close if that's what you prefer. I would recommend Daniela's place!