Ouzo offers a stripped-back, classic Greek and Italian menu that includes superb pizza from a wood-fired oven and a good wine list. The octopus is slow-cooked for two hours in a garlicky broth, then slammed on the coals to sear and seal in the flavor. There's great service, and the superbly designed interior means the heat stays in the kitchen.
The place's immense popularity has spawned an upstairs section called Il Balcon, with outdoor seating overlooking the Parque de los Novios. Reservations aren't a bad idea for the evenings.