The whole experience of staying at Théodora's place as excellent. As a host, Théodora was extremely communicative, friendly, and helpful with everything from accomodating our check in time to making sure we knew how to get to the apartment from the airport. She even checked in on us to make sure we were doing okay with the heatwave (it was over 90 degrees Fahrenheit while we were in town).
The apartment itself is truly lovely - the photos don't do it justice. It's very clean, has everything you need in it, and beautifully decorated. The kitchen has everything you need it in. If you are looking to experience living in Paris, this is the way to do it.
The bed is on the firm side but very comfortable. The apartment building is a walk up, if you would have trouble with stairs, that would be the only thing to note. The building is lovely with a courtyard in the middle; it's very safe and secure.
The neighborhood is also great - just up the block there's amazing fromagerie (cheese shop), lots of local markets with fresh produce, boulangeries and wine shops. It's very close to the Metro - we had no problem getting around quickly. You're also about a 10 minute walk from Sacré-Coeur.
Very very much recommend staying the Théodora - we hope to do it again!