A great place, which is right in front of Sacre Coeur and the funicular. There is a post office box right in front. The Anvers and Abbesses metro stations are right by as well, although Abbesses is very deep in the mountain, so you will end up waiting for the elevators or use the 100+ stairs.
Magdalena is very responsive, and allowed me to check in earlier because there wasn't anyone staying in the unit the day prior.
Wifi is very good. Shower pressure is very strong, which I prefer. Do ask how to change shower temperature, as the water can get very hot. She leaves very detailed instructions on the area and how to use the appliances. The washer/dryer was a godsend. Heaters are very strong, so be aware when turning on the heat.