If I return to Paris, I will stay in this apartment again. It is very easy to reach by a direct train from the CGD airport. It is located near to the RER B train station, the Port Royal station. The Luxemburge garden is with in a short walking distance. One could walk from the apartment to the Patheon, Norte Dame and few other interesting places.
The apartment is clean and well equipped for a long stay. If you don;t mind walking up and down from the 5th. This place is just perfect.