Expert coffee makers. They also brew tea in globes which was something I had never seen before, and am thoroughly intrigued by. Definitely worth visiting.
The first-ever Blue Bottle, apparently, opened in Vienna in 1683. The first Blue Bottle of the modern era opened in tribute in Oakland in the early 2000s, and now serves the absolute best coffee in locations across the Bay Area (and LA, and DC, and even Tokyo). Beans are sourced fairly from sustainable farms with unparalleled care, roasted and brewed expertly, and served in lovely surroundings.