One of the most credible posters on Yelp! (Fong L) has given Baboo Cafe good marks for "good straight-up Taiwanese food" and other reviews were positive. I may have missed it, but I have found no reports here on Chowhound. From its slick website, it looks like a chain, but AFAIK it's a mom and pop operation (maybe a YOUNG mom and YOUNG pop).
1639 Irving Street
San Francisco CA 94122