Wonderfully located. Can't get much better. Near to good restaurants, minimarts and major cultural attractions. Make sure that you take the ferry to Cacilhas and have seafood. My favourite thing to do in Lisbon.
I should add that Ubers are ridiculously cheap, so that makes Anna's place next door to almost everything.
One concern. The elevator requires walking either up or down the equivalent of a flight of stairs. If you have mobility issues or heavy luggage, this will be a problem.