This apartment was great. It's walking distance to several metro stations and sites/attractions, and the street is lined with little restaurants and shops so you don't have to go more than a few steps to get an amazing meal or a cold drink.
It was a perfect base to use for a week of sightseeing in Lisbon and the surrounding area, but still comfortable enough that the three of us could sit on the couch at the end of the day and watch tv or have a chat without feeling cramped.

The only issue is that it's a pretty steep walk up the hill so if you can't handle hills this isn't for you (but then again, if you can't handle hills, you probably shouldn't be going to Lisbon!).