We, my boyfriend and myself, had a great time at Helene's apartment. It's at a great location, at walking distance from the sacre coeur and moulin rouge and with the metro right in front of the door. The area is great to just wonder around in.
Helene made us feel very welcome in the house and explained everything clearly. She was super friendly and left a little book with tips about what to do in the flat.
The house looks just like the pictures and feels very personal. Perfect for a couple who wants to pretend that they are living in Paris for a few days ;)