The appartment is absolutely, definitely VERY quiet ! You can hear birds... It's also well shaped, the 2 bedrooms are really separated and there is plenty of space in the living room.
The surroundings are great, a small park, bakeries, cafes, supermarket around the corner, etc... Public transportation is good too with 2 metro lines (6 and 7), lots of buses... You can join directly Montparnasse railway station.
I didn't meet Elisabeth but we had good contact by email and she was helpful, as well as the house keeper.
Definitely a place to recommend !