The apartment was beautiful and Eleonor is a wonderful, responsive host. The space is elegant and there are lots of wonderfully touches to the decor.
There are other reviews about the shower being accessed through one room but that's not a significant issue given the overall pluses of the apartment.
One challenge is Avenue Barbes - it is extremely busy. And, I would avoid the metro at Barbes-Rochechouart. Much more sane and less crowded is the stop at Chateau-Rouge which only a few steps further in the opposite direction.
We were there over Thanksgiving and could have made an entire American meal there versus the restaurant we booked. It's gorgeous with amazing views of Sacre Ceour from the living room windows. The apartment is wonderful space for people who have been to Paris before.