we just returned from 11 days in Tristan's apartment and were very happy with the experience. it is lovely, clean, convenient, and had many modern amenities.
he is very responsive and flexible even when our airline changed our flight last minute.
the apartment is just steps from a metro stop and an easy walk into the Marais area and we even walked right to Notre Dame one day. there is a grocery store around the corner
it is extremely clean and has modern amenities like a dishwasher and good water pressure! it does not have AC and we were there in the midst of a heat wave. but it was not uncomfortable at all. there is a nice cross breeze and you can close shutters to keep heat out.
the building is very secure and you need to go through two gates to get to the elevator which was not exactly clear upon arrival. but it all worked out.
we are a family of 4 (2 teenagers) and one kid slept on the air mattress but there is plenty of room. he provides plenty of towels.
the views are outstanding and we will miss them! we would not hesitate to return!