26's Corner is nice small Japanese restaurant at 26th Ave and Clement St. Very nice people running it (family I think), with pleasant service. Good selection on menu, but we home in on the Dragon Roll. This is a roll with two shimp tempura wrapped in rice, topped with alternating strips of unagi and avacado, then sprinkled with sauce and tobiko. Very nice colorful presentation and it tastes great. There is now a King Dragon roll which replaces the shrimp with soft shell crab. Miso soup, amaebi, tea, etc. are good too. But we're there for the Dragons!
We live nearby, so parking may be tough, but there are tougher areas to park in SF. You can also get your food to go. Grading harsher than I might because there's so many great restaurants in SF.
Pros: reasonably priced, great signature dish, very nice people
Cons: maybe tough parking, service can be slow