My wife and I stayed for 3 days. It checked off everything we like in a stay. It's centrally located, and easy to get to. Simple amenities are nearby (a supermarket in the square, a cafe with espresso around the corner). It's a 2 minute walk to the metro stop, but Lisbon is much smaller than I expected, and so we didn't really use it much, and walked everywhere instead.
The bed was super comfortable and big, which is good because I'm tall. The ceilings are slanted in the bedroom, but I had no issues with that. It was also surprisingly quiet at night.