Absolutely loved this apartment. Yes, it is four floors up a winding staircase; however, I had a total knee replacement 10 weeks prior to this trip and had no problems with the stairs. You're going to be walking a lot in Paris, enjoy the exercise. :)
The apartment is clean and has everything you might need for a short or extended stay. Convenient to the Cardinal Lemoine metro stop which will take you everywhere you might want to go in Paris.
What my wife and I loved most about this apartment and it's location was the neighborhood. We frequently dined at cafe's in the area. This is not a really big tourist area so you feel like a part of the community. While our French is poor, we found that everyone was very accommodating and helpful and many of the waiters and waitresses wanted to practice their English with us!
My wife and I are looking forward to our next stay in Paris and would love to stay at Axelle's place again!