Location, location, location! Apartment was directly across the street from Luxembourg Garden, a short walk from the train to the airport and several metro stops, and in a great neighborhood with many restaurants and cafes. We had only two people, but it is plenty big for 4 (it has a bedroom plus a large living room with a couch that could easily accommodate 2 other people). Check in was easy, place was very clean, views in both directions were nice. All good.