The location was good — a couple of flights of stairs up (albeit somewhat challenging), and you’re at the foot of Sacré-Cœur (as an admirer of movies by Jean-Pierre Jeunet, I greatly enjoyed staying in Montmartre area). The view from one of the windows over the rooftops of the city was simply entrancing, at all times of the day.
I just wish the apartment was overall cleaner. Also, as there are restaurants nearby, weekend nights were particularly noisy. To top it all up, the elevator broke down towards the end of my stay, which provided an amusing physical exercise opportunity in the form of carrying a large suitcase from the very top of the house (Paris is not kind to wheeled suitcases).
It would help having a “practical guide” available in the apartment (entrance codes, Wi-Fi details, etc.). Raphaël’s friend wrote this information down for me during check-in, but it could be printed out just as well.