El Perro y La Galleta - Restaurante Retiro

Address: Calle de Claudio Coello, 1, Madrid. A quick check on the map can help confirm the entrance and the easiest approach.

Looks like they're open every day, so you don't need to worry about timing your visit around a closed day.

According to available data, this is a restaurant. Better suited to a more relaxed visit, a full meal, and a sit-down experience.