Sebastien's place was very clean, smartly decorated, and in an incredible location. It is a 8 minute walk to the metro and 6 minute walk to the Eiffel Tower. My daughter and I would frequently walk 1 minute out the front door and would be able to see the Eiffel Tower light show at night time whenever we wanted! Sebastien was very responsive and quickly contacted us.
Cons: I believe this place is large for Paris standards, but would be small by American Standards. (Although with two people, we were very comfortable.) My only warning would be regarding the steep "ladder-like" staircase for anyone with mobility issues.
Otherwise, we loved this place and had a wonderful stay here. We would definitely stay again!