Our entire stay was great. Jean Francois' associates met us in the apartment and showed us where everything was. He dropped by later to check in and welcome us, changed a light bulb or two, and generally made sure we were doing well. The description of the apartment was accurate. The space is unique! It is not huge and privacy was fairly minimal, but that was fine with us as we are a family of four ('children' are adults) and that's how we roll on family vacations. It could indeed sleep six, three couples or some soon-to-be very good friends. The 4th floor (plus) walk-up helps with exercise. There are markets nearby, and the kitchen was good for us to prepare most of our meals and eat at 'home.' The washing machine took care of our laundry, and the drying rack in the bathroom dried them overnight. The location was incredible! The neighborhood is a charming medieval warren; there must be 20 cafes/restaurants within a block. You're in the midst of the Latin Quarter; Eglise Saint Severin is within a 3 point shot from our little balcony; the Cluny, the Seine, Notre Dame and the Ile de la Cite are all within 5 minutes' walk; the Sorbonne and Pantheon etc. etc. a few minutes more. We rarely used the metro just because we were so central to everything, walking was irresistible.
We can't recommend this apartment highly enough!