Simply a great location to explore Lisbon at ease. Location is central. Yes you will need to like walking buf it is enjoyable to explore like this. Alfama is a lovely part of Lisbon and the sound of birds in the trees with the rumble of an odd car passing, mixed country and urban which is why we would return to this location. We felt safe all the time. Public transport is easy to use and reasonable prices in alfama near the castle. The apartment is on a hill so be prepared for this but enjoy the views.