The new urban eatery juts out onto Plaça de les Columnes like the bow of a ship. To both sides people are sitting in the open windows, dangling their feet. In no time Federal Café became popular among travelers and local coffee lovers in Pere Garau. Years ago, when Federal opened their first specialty coffee shop in Barcelona, the concept of a place where you can grab a bite at any time of the day was rather unconventional. Today, you find late revelers indulging in a savory breakfast while…