John's place is in a fantastic location--across the street from the metro and within a short taxi drive to many of the main tourist sites. The flat was as pictured though, much like I'm sure most Airbnb flats in Paris, the photos make it look bigger than it actually is--not much space at all to keep luggage for this family.
Check-in was smooth and flexible--had a lock-box for the keys and everything was very clear with John in constant communication to ensure we made it in.
Only big negative was that the cabinets in the bathroom had a strong musty odor, likely due to the lack of ventilation in the flat. We opened up some windows on both ends while we were inside, and things were better. Bathrooms were really small, but for a short weekend it was fine. It was nice to have the toilet and shower area separated.
The one thing that I felt was pretty laughable was that it advertises "Free Breakfast", but when we arrived and found there was only tea and coffee (no food items at all), the response I got was that I needed to take that up with Airbnb because Airbnb considers tea and coffee to be breakfast, but regardless of what is permitted by Airbnb I personally believe this is misleading. Most Airbnbs I've stayed in have included tea and coffee without claiming to offer breakfast included. It's not a huge cost or anything, but when you're traveling with children it is important to know you have something for them to snack on in the morning.
There is a market directly across the street from the flat we were able to purchase breakfast items as well as a few bakeries nearby as well.
Overall it was a good experience for the money considering the limited options available at a reasonable price in central Paris in the summertime for families that want some separate space.