We spent almost 1 week in this apartment. We were 4: 2 adaults and 2 children (1,5yo and 3,5yo).
The apartment is perfectly located right in the center of Paris - Louvre is just 2 minutes walk. A lot of restaurants, supermarkets, bakeries, pharmacies etc.
The apartment itself has everything you would need staying in Paris. But there were some issues:
1) The bedroom faces inner courtyard and there were constant noise by people walking up and down to their apartments. Maybe a plastic window would solve this problem.
2) The apartment has a feeling of "being used" (the floor creaks everytime you step on it or for example the switch in the kitchen is broken. The cleaning also could be better, but linens and towels were perfect.
3) The apartment is also quite dark. Definetely not enough light.

Nevertheless it's a good choice for people decided to stay in the heart of Paris. We had not met Delphine because of our schedule but we recieved all instructions how do get to the apartment in time and it was pleasure to communicate with her during our trip.