Taiwanese food in the city?
Try Taste of Formosa in the outer Richmond. The main dining room is upstairs and where they seem to direct most of their attention. Warning: They serve stinky tofu, so you might find it uncomfortable if you don't like the smell. Ground floor would then be better choice.
This quiet, nicely appointed place is good, and the scallion pancakes (cong you bing 蔥油餅) are unusual and delicious. Neither thin and crisp nor thick and flabby, they're custardy in places and flaky in others.
Taste of Formosa
2428 Clement St (between 26th Ave & 25th Ave)
San Francisco, CA 94121
11:30 a.m.-11 p.m. Wed.-Mon (SFGate's review says it closes at 11:30)