TL:DR version: Great space; excellent location; full "Paris experience," i.e. you must be able to tolerate street activity; outstanding, gracious and responsive hostess.
If you want to be part of Paris, not just "in Paris," this is the place for you. Think of the opening scene of Disney's "Beauty and the Beast" movie and/or cartoon. The decor is like a nice chalet and the location is near the Chatelet Station so all of Paris is easily accessible by Metro and RER. The apartment is like a fortress with natural stone walls and high beamed ceilings so the sounds of the street are not too intrusive. Open the large windows and you are in the thick of and ethnic dining (mostly pizza and falafel) restaurants with much action and human interest. If you are a "people-watcher" -- or "-listener" -- you will have endless fascination. The bedroom is at the rear of the apartment and has a door that shuts out street noise if you retire early but things shut down at or around midnight anyway, so the street noise was not a problem. Delivery trucks, street sweepers, etc. start around 07:00 Paris time but, again, were not a problem for us tucked away in the back.
Rachel provided all the amenities we expected, e.g. hot pot, dishwasher, washer/dryer (one of those European combination things). She also had a nice bottle of Bordeaux which quickly died a hero. We had some difficulty with directions (more later) and were a bit late and she was literally hanging out the window to be sure we did not miss the place. We had a few questions -- no issues, just requests for information -- and she responded within minutes. NOTE: She does not speak English so you may want to enlist Google Translate or such to stockpile your questions in (French) writing. That worked well for us.
Re: Directions. We took the Eurostar from London to Paris and the RER B to Chatelet station which is the easy part. Finding our way out of Chatelet was something altogether different. It is big, complicated, busy and full of stairs. Follow the "green man" exit signs until you see a "sortie" board and look for, ""Marguerite de Navarre" or the Forum. At the street, turn a hard left and in <200m and you are there.
When our children were young and we found a good babysitter, we were always reluctant to give her name to other parents. We always wanted her available for us. And so it is with this place: When we return to Paris we want it to be available -- extended stay if possible. There is every reason to do so. Au revoir, Paris.