Great location: 2 minutes walk from Lamarck Caulaincourt metro, many places to eat nearby, easy walking distance to Sacre-Coeur and all the buzz of La Butte Montmartre.
The apartment is on the 2nd floor and is served by a small functional lift. It felt secure, with two coded doors at ground level and a substantial lock on the apartment door. The main living/dining room is bright, spacious and a delight to spend time in, especially when the sun is shining and it's warm enough to have the French doors to the balcony open. The size of the bedroom is adequate. The bathroom and kitchen are small but sufficient to satisfy our needs for a short stay - we mostly ate out. Good wifi.
I agree with others that the apartment shows its age; this does not put me off returning. And the quirkyness gives it character.
Julien is the perfect host: responsive, showed us around on arrival, and assured us that he was available throughout our stay should we need assistance (though we did not put that to the test).
Delightful.