This document describes AirBed & Breakfast, an online marketplace that allows people to rent out space for overnight stays, such as a spare bedroom or air mattress. It notes that over 660,000 people travel to San Francisco each year for conferences or events, but many cannot afford hotels. The solution proposed is AirBed & Breakfast, which will validate the market need and provide an alternative accommodation option. Financial details and projections are also included to show the business model and its potential.