The best part of Diogo's place was the location. It was right next to Biaxa-Chiado metro station and close to bus/trams that could take us to Alfama, Belem, and other major places in Lisbon.
One negative thing was the noise level from the street below at night, but guess that is expected when you stay in a very busy part of the town.
The room itself was very clean and big. I would definitely recommend Diogo's place and would stay there if I were to visit Lisbon again.