First the host: Gaspard is an incredibly friendly host, he was very responsive throughout our trip, whether it came to getting access to the different gates or helping store our luggage for a few hours after check out and before our flight back (thank you again)
Second, the amenities: the place was as described - very clean, a lot of light during the day via the roof window (appartment 21), and an awesome bathtub to recover from these long walks. The system to pass the different gates with our phones also worked very nicely and didn't let us down.
Finally the best part in my opinion: the location. While Pigalle is the former red district, don't let this fool you. The areas nearby are very gentrified, and there are many cute shops and cafes in the nearby area, especially going down towards St George metro station or, our favorite, the "rue des Martyrs" street. You can easily walk all the way down to the Opera / Grand Magasins department stores on Haussmann boulevard and back.
Will definitely consider this residence again for a future Paris adventure!