As others have said the view is amazing. And the location is excellent -- one can walk to many attractions, restaurants, shopping, plazas, and neighborhoods. If one needs to go further, there is Uber and there are cabs (I found these were actually the better value; some drivers give great tips). Don't miss a night at a Fado restaurant or the museum and an exploration of nearby Alfama or the tile museum (further afield but worth it). After exploring myself, I took Tram 28, so strongly advised, but was less than enamored with it.