Miradouro de Santa Catarina is a square with a wonderful view over the harbour and the Tejo river. If the weather is fine, it might be even possible to see the Atlantic ocean.
The square is a popular meeting place for artists, students, and connoisseurs of the art of living. The little coffee kiosk cares for the right catering. Lisbon travellers claim that Miradouro de Santa Catarina is the perfect place to be on a summer night.