I had a great experience at Elquisson and Julia's place. Elquisson was really nice since the first email exchange and even better in person.
The listing was very accurate on what to expect and the location was fantastic: very central, a walking distance to Alfama, Barrio alto, Placa do Commercio, Tram 28 stop, many more attraction and only 20 minutes away from the airport. Very, very strategic.