Alexandra's place was lovely and provided a good home base for us while in Lisbon. However, the apartment wasn't clean when we arrived, and we didn't feel like the cleaners did a thorough job once they did get there.
Alfama is a beautiful neighbourhood but we ended up spending the majority of our time elsewhere, and it felt like a bit of a trek to get back every evening. Plus we felt a bit unsafe some nights, walking home in the dark alleys. That said, nothing bad ever happened. There's a great coffee shop close by (Copenhagen Coffee Lab), which was a highlight for us!