This place is exactly what we needed for our 3 day stay in Lisbon. It's in an amazing location and very clean. We had a seamless check-in process and even when we had some bumps in the road in our travel plans- everything worked out great.
A couple of things to note before you book: first, the bed was not comfortable. We were jet lagged and also exhausted from walking around the city, so sleep wasn't an issue, but if we stayed any longer it may have been a problem. Also, sound carries very easily from the street outside and from the flat above. We were woken up to the hustle and bustle of the city and/or loud footsteps above. Not a huge issue, but again, for light sleepers you may want to look elsewhere.
Only other tip would be more pillows, blankets and towels would have been nice. Overall, it was a good experience since we were there to really enjoy the city. A great location!