The flat is definitely pretty and close to Belem(walking in 15mins) which has the absolutely beautiful view with some historical buildings. I would recommend my friends to live in Manuel and Catarina's place not only because the short distance for sightseeing, but also because Manuel and Catarina are really nice, friendly and helpful!! You will feel free to ask them if you have any problems. Just feel like at "HOME"!!
So lucky to stay at their place. I had a good memory in Lisbon:D