This is a great location. Metro is close by but honestly we didn't need it. We walked to/from Notre Dame, the Bastille, and other spots since the flat is centrally located. The building is quiet and safe, which was important to us as a family traveling with three young children.
The flat has three bedrooms, with one master bed and two bedrooms suitable for children - one with a single bed and another with a bunk. One of our daughters preferred to sleep on the couch and said it was comfortable. There are separate rooms for the toilet and for the shower/tub, and there is an all-in-one clothes washer-dryer in the flat which we found very convenient.
Corinne was a great communicator and responded quickly to a couple of questions we had. One suggestion is to update the towels and bathroom, which seemed a bit dated. Otherwise, Corinne's place is a very good option for families traveling with children who want to be within walking distance to major attractions.