I just checked out Himawari Ramen in San Mateo. This place is legit. I went by myself and had a half shoyu, half fried rice lunch set. Everything was pretty good. The soy-sauce broth had a lime(yuzu?) flavor to it, pretty nice.
My only complaint was that I think the fried rice is not freshly cooked to order. I think they just make a batch and give it a quick refry when the order is taken. Otherwise, they make a nice version of Japanese style fried rice.
Himawari is now neck and neck with Santa for favorite ramen joints in the bay area.
Also, if you are in the San Mateo area. Please try Tombo, just a few stores down from Himawari. It's really excellent handmade udon. Really great but noone seems to eat there. Try the octopus balls!