My family's stay at Charles' apartment was our best stay to date in the 5 years we have been staying in vacation rentals through airbnb and other services.
As a host, Charles was incredibly responsive and timely. Another airbnb host cancelled a reservation we had made months prior while we were on the train from London to Paris. In less than an hour Charles confirmed the reservation and made arrangements for our check in. Charles also aided us in booking a taxi to go to CDG to catch our flight to our next destination. It was far more convenient and efficient than public transit since we had luggage and we're travelling with our infant son and toddler daughter.
The apartment was very nice. Well furnished and decorated. Everything was clean and functioned. Apartment was overall very charming. We didn't notice and city or street noise during our stay. On our last night someone else in the courtyard had a party until 4 am...obviously no fault of Charles but possibly a consideration though I also have no idea if that is a frequent weekend occurrence.
The location of the flat was perfect. Everything need as far as food and conveniences go is within a couple minutes walking distance. The metro is very near and Gare du Nord is an easy walk as well.