Joana's apartment is a great place to stay in Lisbon. The sitting room is very small, so only a place to sit in the morning before going out exploring, but the bedrooms are a good size with very comfortable beds. There is an adequate kitchen area with a dining table, so if your intention is to visit Lisbon to explore, this is the place for you. If your plan is to stay in lots, then its size may not work. Be aware that it is up 4 flights of VERY steep stairs. Not a problem if you are in good shape, but it will catch you out if not!
The location is excellent - in the middle of Alfama, the heart of Fado, a tangle of cobbled streets with many small bars and restaurants to explore. It's close to the river with fantastic views of the sunrise.
Communication and check-in were excellent and I would not hesitate to stay there again - exactly what a city-centre Airbnb should be.