The place is ideally located in Montmartre. Very close to Place du Tertre, Sacre-Cœur and the cool Montmartre spots. There is a metro station nearby.
Communication was optimal and the check in very smooth. Johnathan wasn't there but his housemate Anita was very nice and arranged everything with no issues whatsoever.
As for the downside, the futon in which we slept did the trick but wasn't all that comfortable. Also, when we arrived there was an odour about that resembled butter (maybe from cooking). By the next morning it had vanished, though.
Overall it was a good experience and I would recommend the place