I'd give this 6 stars instead of 5 if I could. Fantastic stay at Sandra's apartment!
Her friend Sara was our main contact, who was very helpful from before arriving until after check out. Sara made it easy to find the apartment (note: Alfama neighborhood has windy cobblestone roads, many which are pedestrian-only), and then she walked us through a full packet of information about recommended restaurants nearby, public transit options, popular museums, etc. and also showed us the highlights on a map. As guests that had never been to Lisbon before (and tend to research on the fly), we found this guidance incredibly useful.
The apartment was also lovely. It had enough space for my boyfriend to work remotely from the living room. And it was in a great location in Alfama. The balcony looking out to the neighborhood was picturesque. We would absolutely stay here in again next time we come back!