You can enter many an “Irish pub” in San Francisco with an ample Guinness flow and trad music on the PA that is about as Irish as a bowl of Lucky Charms floating in green beer. There is no Guinness on tap here in this small Inner Richmond corner bar, but don't let that fool you: This is the real Mac Aodha. The walls are covered with hurling posters, flags of counties back in Ireland, and newspaper clippings and other nuggets of Irish-American lore dating back to the 1960s. If you insist on a dark pour, owner Annie O'Keeffe — yes, that's her name on the sign outside — will keep cracking cans of Guinness open for you as long as you need.