Alfama, where the city remembers
Start in the oldest quarter, the one the great earthquake of 1755 spared. Alfama has no plan and wants none — it is a tangle of stairs and washing lines and cats, tumbling down toward the river in no particular order. Get lost on purpose. The miradouro at Santa Luzia gives you the whole terracotta sweep of it.
This is where fado was born, in these taverns, and it is still where you should hear it — not in the polished tourist houses but in a small room where someone's grandmother silences the table with the first note.