We enjoyed our stay at Susana's place!
It is located in the heart of Alfama area and close from Santa apolonia station (8 min. walk).
There is a hill to get to the apartment but it wasn't too bad. We had our giant suitcase and had to pull it around 150m without too much struggle.
The apartment was clean and had everything we needed and the bed was very comfortable. The AC kept the room cool and we really needed it as the temperature in Lisbon was over 30 degrees.
There are so many restaurants, cafes, and gift shops in the area and it did get pretty loud on Friday night but we didn't mind it.
I'd recommend staying a Susana's place if you are looking to stay in Alfama!