Note that David has two apartments in this building, and that this review is for the one on the 5th/6th floors (6th/7th by North American counting). The reviews (at least the older ones) for the two apartments tend to get mixed up on the VRBO website.
As noted on some other recent reviews, the apartment is in fact two apartments--a 1-bedroom with a sofa-bed in the living room on the 5th floor, and a 2-bedroom on the 6th floor. The apartments are connected by the back stairway that connects the 6th floor to the other floors and the entrance foyer. Each apartment has a bathroom with a shower (and a tub on the 5th floor). The main kitchen and living room is in the 5th floor apartment, while the 6th floor one has a kitchenette.
For our group (three couples), this 2-floor arrangement was just fine--the upstairs worked well for sleeping/showering/etc., while our group time was spent in the 5th-floor living room. Plus, the view over the Paris rooftops from the top floor is really special. For some, though, the rather narrow/steep stairs between the floors (no elevator access to the 6th floor), and the semi-public nature of the passage between apartments might be a factor to consider, depending on the make-up of your group.
Most of the fixtures and fittings in the apartments are quite new, and in very good shape, plus everything was very clean when we arrived. All the beds were very comfortable, and all the necessary apartment basics were there. David was very helpful in getting us settled in, and pointing out the amenities of the neighbourhood. We had time to try two or three of his food reccomendations, and all were excellent.
As stated by others, the location is very, very good. The Rue Montorgueil area is brimming with restaurant options, and the shoppers in our group had lots of fun in the area north of the apartment. There are several very good museums (Arts et Metiers, Picasso, Pompidou, etc.) within 10-15 minutes walk. The Seine and the Louvre are only 15-20. And a stop on the 3 and 4 metro lines is 1 minute from the apartment's front door, to connect you to everywhere else.
For our next Paris trip, one of David's apartments (depending on the size of our group) will be at the top of our list for consideration.