We enjoyed our stay in this cozy apartment. I want to thank our host William for being flexible and checking us in half an hour earlier, and allowing us a later check out today. Traveling with two seniors and two children is challenging at times :).
The kitchen is fully equipped and had everything one needs to prepare a breakfast. The apartment has three bedrooms and easily hosts a group of six. Bercy is not the coziest area in Paris, but it's conveniently located in 12th arrondissement, and is family-friendly. It's on twenty minute walking distance from Marais, and the metro is very convenient. It takes you pretty much everywhere.
I would recommend this place.