Céline was a wonderful host. I was traveling with my kids from the US and she was very helpful on how best to get to her apartment from the CDG. We followed her directions to the t and had no issues. She greeted us at her apartment and explained everything very well.
It's a great location in the 11eme, with sweet cafe and a few little restaurants just across the street. There's a small grocery store on the same block and the Metro is a stones-throw.
Céline's apartment is on the 5th floor (elevator) with an amazing view of the church down the street. The windows are French doors that open up all the way to let in the 'cool' July breeze and church bells, an experience that was new to my kids and one they won't soon forget.
We spent the week walking around Paris. Céline's apartment was a great hub for doing just that; we either walked (~3 miles to Arc de Triomphe) or took the Metro. I think we covered every Neighborhood in Paris!!
I plan to recommend Céline's apartment to friends and family and I plan to stay again when I'm back in Paris.