The ambiance and staff are equally wonderful. I enjoyed the hell out of the soy Cortado; Smoother than Blue Bottle's Gibraltar/SG-120. This is my new favourite coffee in San Francisco.
Awesome coffee -- really enjoyed my cappuccino. Great service, the barista wanted to make sure he spelled my name right in case I wanted to Instagram my coffee and their famous pineapple wallpaper :)
Wrecking Ball is small, shiny and minimal (if you exclude its wild, pineappled wall). It's located at the peaceful end of Union in Cow Hollow and serves the best coffee on this side of the hill.