Brick walls, 40 tables, sandwiches with local ingredients, art from Somerville natives and a huge bank vault in which to imbibe your daily caffeine intake? This is the wonderfully quirky Block 11. Owner Jennifer Park also owns the impossibly hip Diesel Café in Davis Square, but Bloc 11 has a decidedly more sophisticated feel than its hipster sister. Don't miss the courtyard seating or the freestanding fireplace in the back; watching new baristas learning how to pull the perfect espresso on the trainer machine behind the main counter is also entertaining. Of special note is "The 257" sandwich, a sinful concoction of prosciutto, ricotta from Capone's market across the street and caramelized onions.