This groovy treehouse of a cafe specializes in that Amazonian pick-me-up, coffee-substitute, Paraguayan petrol known as yerba maté. Technically a tea, it's fair trade, organic and highly caffeinated, and they make it into lattes, mix it with vanilla and hazelnut or raspberry, and serve it by the cup and shot. Pick a cozy nook lit by stylish peach basket lamps and stay a while.