Stayed here for 2 nights in January. The walk-up is indeed a genuine "4th story" as advertised, but this provided a view of the city along with absolute silence. The room was very large and Sara was accommodating of all requests. The other bedroom was rented out to other Airbnb'ers but both rooms are under lock and it felt like having my own apartment.
*Note for 3 people groups: there's one large bed and one small bed. This didn't affect me.