Great place - Highly recommended.
This place has everything you need.... Located one block from the Metro line and 10 min walk from a train station arriving from the airport. and in the great neighborhood of Saint Germain de Pre. There is a wonderful bakery just outside your door and a supermarket a few steps away.
The apartment is exactly as the photos and is very quiet with a view of an internal courtyard. And the bathroom is great, with a walking shower (rare in Paris).
the host was incredibly friendly and highly responsive: from the first moment of contact, she would reply within minutes and accomodated all our requests. She sent very detailed instructions for check-in / arrival and we faced no issues whatsoever during our stay.
Location, location, Location.... on top of what has been already mentioned, the apartment is 10 min walk from Notre Dame and ile Saint-louis. There are two Velib bike stations outside the door and you can be anywhere in a nanosecond.