First off, the location cannot be beat! Within literally two or three minutes outside the door of the apartment are restaurants of the highest quality, and they won't break the bank either. We could have happily eaten different meals for a whole week without walking more than four minutes from the apartment. The old town, trams, metro and Alfama are also within easy walking distance - don't be intimidated by the castle atop the hill. It's actually not that far away.
The apartment itself is a charming place, tastefully furnished. It's on the 5th floor, no elevator, so be prepared to huff and puff up the stairs. In the summer, with the breeze blowing through, it must be a lovely place. We stayed in the winter, so it got a little chilly, but with the heater and some blankets, we managed well enough. The age of the apartment also means that if you plug too many things into the power outlets, this might trip the electrical circuit. But a quick reset means problem solved. Well recommended!