I stayed for just over a month as i was in town working. The apartment was perfect for me, it's in a great location right in the centre and really near to where you find most of Lisbon's world food places.
Sarah kindly arranged for a weekly cleaner and the apartment had all the facilities that you'd need for a long stay. I was met at check in and that was super simple, communication throughout was easy, and most important no noise in the evenings.