|Kirk Harper and John Quintos operated an SF restaurant and nightclub, 330 Ritch Street, for 16 years. They also have an obsession with Lambretta motor scooters. Combining this last passion with Blue Bottle Coffee, they started opening a series of Lambretta-themed coffee kiosks across the city once they shut down their original Cafe Lambretta in Nob Hill. The chains in this caf� are named after Lambretta models: Cento, Special Xtra, Vega. All of them serve top-notch espresso. All of them skimp on any customer amenities by operating as glorified lemonade stands in city alleyways. Who would have thought that a lack of seating or bathrooms would ever become a chain concept?