For our three days in Paris we had a lovely stay. :)
Pro's
1. Location of the appartment was perfect. It was in close proximity to Gare du Nord, Montmartre and the city.
2. The room was clean and well taken care of.
3. Communication with the host was clear and helpful
4. Amazing panoramic view.
Con's
1. Due to thin walls we had some noise from the neighbours. (only the first evening)