We had a great stay in this apartment. Very nice rooms, fully airconditioned, good wifi (important for the kids) and we got a warm welcome.
The apartment is in the middle of the Alfama district, with narrow streets with beautiful sights and it's lively residents. Tram 28 will bring you up and down the hills when you're tired of discovering Lisbon (the tram runs through the street; a stop is 100 m from the appartment). 2 Days a week, there is a big flea market nearby and St. Jorge Castello is a 15 min walk. 300 m (uphill) there is a square with a small supermarket (with fresh orange juice), a couple of bakeries and an ATM.
Lisbon is a wonderful city; the apartment absolutely contributed to our (parents, 3 kids > 12 yr) wonderful experience.