Can I take public transportation from the San Francisco Airport (SFO) to the B&B? How much does it cost?

Yes! The total cost is approximately $10/person.
From SFO:
– Follow the BART signs to the subway station on the terminal’s lower level.
– Board any northbound train.
– Exit at Powell Street Station.
– Exit the subway station at Powell & Market Sts., where the cable cars turn around.
– Walk to the sidewalk bus stop for the #5 Fulton bus, heading west (outbound) towards Ocean Beach.  Ride to the McAllister & Pierce stop. (Please note: the #5L bus runs a limited route and stops at McAllister & Fillmore instead.)
– Exit at McAllister & Pierce. Walk down McAllister 1 block and turn left at Steiner Street. We are the last building on the left, at the intersection of Steiner and Golden Gate Avenue.