Stayed at David's AirBnB in the Montmartre area of Paris for 3 nights in October, 2019. The location is fantastic, there are 3 metro stations within easy walking distance. I would suggest taking the metro from Charles de Gaulle airport and then transferring at Gare de Nord onto the the pink line, can't remember the number that will take you to the Chateau Rouge station where you will get off. It is less of a steep incline to get to the flat, especially when you have large luggage in tow. The beds are comfy, the flat was clean, with great restaurants close by. David himself was very prompt to respond to email and was thoughtful.