My family and I stayed at Claire's apartment for a month. The apartment is spacious, we were three adults and one toddler and we had plenty of space. My husband and I even worked from home during this time and didn't feel cramped.
The apartment is in an amazing location, right by the Seine and Notre Dame, multiple boulangeries, an outdoor market, an amazing fromagerie, multiple Metro and RER lines near by, not to mention the restaurants. We walked to most places as everything was within a 20 min walking distance. As others have noted, the apartment is on a busy street, but as long as the windows are closed, you don't hear it. Wish we had these windows in our own apartment.
Claire has been very thoughtful in keeping the apartment well stocked. The kitchen is well equipped, we cooked many meals at home and had everything we needed to cook and store food. I loved going to the market to buy fresh vegetables, cheese and fish for our meals. She also has two cribs, a high chair and even a stroller. There were also many books and toys for little kids. The apartment also has a washing machine, a dryer and AC, pretty unusual for a Parisian apartment. The building has an elevator which was very key. The elevator is very small, fit normal humans perfectly find but would strongly advise on a compact stroller.
Claire herself was so nice. She always responded right away to our many questions and requests. She also checked in on us when there was a mini heat wave during our stay to see if we wanted her to come by to set up the AC. She is the ultimate host.
As a clean freak with a toddler that puts everything in her mouth, I will say that we wished that the apartment was cleaner. The apartment was clean enough and I think probably meets most people's standards.
Would definitely love to stay in her apartment again, feel like we really found a gem.