Time Out says
Somerville seems to have a thing for repurposing stodgy old buildings and turning them into hip social spaces. (Exhibit A: the castle-turned-cultural center known as the Armory.) This Union Square café serves a ton of food and drink options, and many young locals chill the day away over sustainably-sourced coffee. Circle around to the far side of the coffee bar and you’ll notice a massive bank vault, where you can enjoy a drink while feeling like you’re in on a heist.