We loved this apartment. We were a family of four (2 adults and 2 little kids aged 10 and 7). It was great. We cannot speak highly enough of the apartment and the host Ben. Communication was great and Ben met us at the metro station earlier than normal check in time.
The apartment was clean with all the facilities and amenities that you'd need. We were there for six nights. The location was excellent with Notre Dame being just a short walk up the street. It was no more than five minute's walk to the metro, probably less. It was right near Shakespeare and Company so that was a highlight. The metro station was an easy distance from all of the sights we wanted to see in Paris.
The apartment was appealing and stylish and we felt good there. We will be recommending it to anyone wanting to go to Paris.
The only downside was the fifth floor location with no elevator but we knew about that because Ben mentions it in the description. We had planned for that.
All in all an excellent stay.