This apartment is pretty special. The view is stunning, it was like something out of a movie. You can lie in bed and see Sacré-Cœur, and from the bedroom window you can see the Eiffel Tower. The view out the other side is over rooftops for miles out to the hills surrounding the city.
The apartment is small but everything is in Paris. We are a couple with one child (7), and it was perfect for us. She slept in the lounge on the fold out sofa with no problem. Furnishings are nice and the double bed is firm and decent. Very warm, it has heaps of windows - lots of views and ventilation. Black out curtains in the bedroom for sleeping in. Clean bathroom and lots of hot water. Small but functional kitchen.
The area is heaps of fun, low-key parties on the steps of Sacré-Cœur every night (and you can't hear any noise in the apartment), lots of restaurants around and the walk from the Metro through the tourist street to the funicular is fun. If you have a Metro pass the funicular is included.
I would highly recommend the apartment, and Christian, who made staying here very easy and made sure we had everything we needed. Will definately stay here again.