I have stayed in my fair share of AirBnbs around the world and honestly - this was one of the best I've ever experienced.
The flat itself is incredibly chic and adorable; i am 30 years old and live in New York City and I honestly would love to call this apartment my own if I could. The moment you step inside you can tell that it is owned by someone with great taste who is very, very thoughtful. The entire place feels and looks brand new, is very clean, and has everything you could want in an AirBnB. Personally I don't choose to spend too much time in my hotel or AirBnB when traveling and prefer to be exploring the city as much as possible, but this flat is so airy and relaxing that I wouldn't mind hanging out, having a glass of vinho verde, and watching a movie. The bed is super comfortable (fits 2), and there is also a pull-out couch if you prefer not to share the bedroom.
Sandra was not in town to meet us and check is in, but Artur (who helps manage the flat) was unbelievably communicative during the entire pre check-in process. He met us on time to help carry bags up stairs to the apartment, provided an awesome overview of the neighborhood, and even gave us some great local tips for how to spend our time in Lisbon. We were in Portugal for over a week and honestly, his hospitality and recommendations helped us have one of the best days and nights of the trip. The flat is in the heart of Alfama, and is quick walking distance (~20 min walk tops) to anywhere in the surrounding neighborhoods. The flat is located off of the street within a courtyard, so it is pretty quiet at night and offers an adorable view of red rooftops up the hill of the city.
The only thing I would note is that it is a ~3 story walk up and the stairs are fairly steep, but honestly this is very common for all of Alfama and Barrio, as they are older neighborhoods and have older apartments. For total transparency - we were able to make it up and down the stairs with our luggage after a night of partying and managed just fine. They may be more difficult for anyone who has trouble walking.
Overall - I cannot speak highly enough about our stay in Sandra's flat in Alfama. I plan on returning to Lisbon in the near future, and will absolutely be re-booking this apartment for my stay. It's the perfect cozy, chic spot to call home for your visit.