Very central, in the middle of Alfama (get ready to climb though), close to the train station and even close to nice spots by foot (we only take the bus/subway) a few times.
Very close to some nice restaurants and bars (from the apartment at night, you can even heard some fado from the street!)
Maria and Pedro were helpful and nice, always reactive to our questions.
If I have one place to recommend if you visit Lisboa, here it is!