We had a great stay at Frederique's flat. The flat was comfortable, clean, and very spacious, especially for Paris. The bed was comfortable and plenty big for the two of us (we're average sized individuals). It was nice to have access to a full kitchen, including an espresso machine. The location was great as well. The Pigalle neighborhood has a ton of cafes, bars and restaurants and Montmarte was just a short walk away. It was super easy to get around the city as there is a metro stop basically right outside the building. Frederique met me at the flat to give me the keys and show me around. She also provided a ton of helpful information, including a list of recommended restaurants/bars in the neighborhood, recommended Paris attractions (outside of the obvious ones like the Eiffel Tower and the Louvre), and suggestions for getting around certain parts of the city. I did not have any issues communicating with Frederique before or during my stay. Overall, we really enjoyed our stay here and would highly recommend it to others.
Note: There is climb up 5 flights of stairs to get to the flat. This is not a criticism; we knew what we were getting ourselves into when we rented the place. I just want to point out that it might not be ideal for someone who is traveling with tons of heavy luggage.