We had a great time staying at Alexandra's. It is conveniently located in Alfama, so you can walk the neighborhood by foot and really get to know the neighborhood. The place was very clean and had everything we needed. There are two beds that are stacked on top of one another, so we just restacked every morning to have more space.
The apartment definitely uses it's space efficiently, it has a nice bathroom, sink, stove. It worked well for two (petite) people, but I think it might be harder to navigate with people who would prefer more space to move around. The apartment has a narrow set of stairs with no elevator, which worked fine for us, but would be hard to get to with anyone with limited mobility.
Alexandra was a great host - she was very responsive and addressed and questions and concerns immediately. She also has a great folder of suggestions that were really helpful. We really liked our home away from home in Lisbon. Thank you, Alexandra!