We stayed at the end of October in Matt's apartment in Alfama about 5 minutes walk from Santa Apolonia train station. Really quiet neighbourhood. Perfect spot for exploring the city and beyond.
Matts apartment was brilliant. It felt like being at home and has a lovely outdoor space which was very private. Everything worked and everything was made easy as Matt arranged a transfer from the airport when we arrived.
I would recommend that you should stay here as it is probably one of the best air bnb places in Lisbon.