Diogo's place was a perfect location to go everywhere (by foot + metro & tram very close) ; there is a good place for Pasteis de Nata at less than 100 meters (Mantegaria) open till midnight :)
The room I had was clean and quiet (the window has "view" on a small inner courtyard) ; the apartment on the other side of the courtyard was under reconstruction so there was some noise but not early in the morning, it didn't bother me.
I would choose the same place for another trip to Lisbon !