Let's start with the view: INCREDIBLE.
It appeared to us that Charlotte's mother is the actual host (and she was extremely friendly and welcoming) and though we speak a little French and were able to communicate just fine, note that she does not speak English. That said, I believe Charlotte was reachable at any time.
The location is near the Eiffel Tower, and plenty of eateries. We also felt like we were in a very safe neighborhood.
The place is rather small, but the view more than makes up for it, and we had all of the amenities we needed. We also received a welcome bottle of Bordeaux on our first night.
My wife and I would stay again in a heartbeat.