The kitchen of Cathy Bailey and Robin Petravic, who own Heath Ceramics. The room has concrete countertops and stainless-steel appliances; all except the refrigerator are Craigslist finds. My guess is that's aBertoia barstool with a lovely vinyl cushion in sunflower. The Heath tile color might be New Mango or Caramel, although it may be custom, since, you know, these folks run the place.
*Update!* It is custom. This, according to the SF Chronicle: The couple created the vibrant backsplash using Heath overstock and imperfect tiles left over from a custom order (for a building on the University of Pennsylvania campus). Bailey installed the tiles in a staggered pattern in the kitchen to help hide discrepancies in the lengths. Although the tile is not part of the regular Heath line, the bright yellow color was added to the company's tile palette.
Photo via design*sponge.