When it's about location, location, location. This one's hitting the jackpot. In the heart of Alfama, but quiet.
The apartment is really clean and well equipped.
Once you are there, you understand why Pedro picks you up from the apartment: not an easy place to find on your own. Pedro is nice, and the only negative thing I can think of is that the shower is a bit small. So: highly recommended!
Tips:
there is a rather good supermarket in the Apolonia trainstation.
Tram 28 is nice, of course. The 12 en 15 are less crowded and also nice.
Graca is a nice neighbourhood to explore if you want to see less people like yourself (tourists)