This is a brilliant place to stay in Lisbon. The flat itself is lovely and spacious. Great bed, good showed, comfortable sofa, and we received a very warm welcome, including a bottle of red wine and some custard tarts - delicious! The apartment is located just off the main avenue which leads to the different areas of Lisbon you'll want to explore. There's some great local places to eat nearby (Restaurante Coradinho is just down the road, amazingly well priced and delicious! Get their Coradinho steak, it's a winner) and plenty to explore if you go further afield. So - definitely stay here.
While in Lisbon, be sure to walk through Alfama and Bairro Alto, and if you have the time, a day trip to Sintra is a must.
Lisbon is a gorgeous city - definitely worth a trip!