As much as its confident modern cuisine, the Loggia's big draw is its setting, on a panoramic terrace overlooking the old town. There's open-air seating for romantic sunset dinners, or you can sit inside and admire the views from its glass-walled dining room. Its lunch buffet (€9.50) is great value.
Note the restaurant is inside the Museu Nacional de Machado de Castro – enter the museum and turn left just before the ticket office.