The Yokohama is located on Blanshard Street, just across from the Royal Theatre (close to the Court building). It is incredibly busy and service suffers on nights when there is a popular concert at the Royal, so it is good to check out the Theatre website first. If it's a concert night, come at 5 p.m. or at 7:30 p.m. in order to avoid the worst of the crowd.
This restaurant is an oft-overlooked but excellent dining experience. While you can order from the menu, the $23.95 all-you-can-eat dinner option (offered Tuesday through Saturday) is a very inexpensive way to have a variety of items at minimal cost. A very important distinction: this is NOT a buffet where things are laid out and you help yourself, not knowing how long it has been sitting; it is all-you-can-eat, which means you order as much as you want and it is made fresh.
There is a wide selection of "kitchen" items, including appetizers (the tempura sauce is excellent), a la carte items (especially the chicken teriyaki), tofu & noodles (don't miss the agedashi tofu) such as agedashi tofu), and soups/salads (the miso soup and sunomono salad are highly recommended). The broths and sauces are excellent, and that is so important. Given how much soy sauce I use, a nice ending is ice cream (I like to end on a scoop of strawberry and a scoop of vanilla).
There is a reasonable selection of sushi items, including cones, rolls, nigiri (fish on a small ball of rice), and sashimi (fish without rice). The sushi menu is somewhat limited, featuring spicy or plain salmon or tuna or BBQ salmon skin, as well as items of more appeal to the sushi novice such as california (avacado and fake crab), cucumber, avacado, and tempura prawn. Recent additions include flying fish roe (good) and chicken or beef teriyaki (kind of boring, but "safe" for sushi novices).
In terms of ambiance, they have nice, appropriate decor for a Japanese restaurant. The music is not always fitting, and they do broadcast hockey games and the like on their big screen TV which you may consider a plus or a minus (if you don't want to see it, there are tables that don't have view of the TV).
Please take your friends with you, because it's hard to find places where you can have a good amount of Japanese food without running up large bills. This is an excellent place to get sushi, but is not near Chinatown so tends to be overlooked. I would be very disappointed if Yokohama went under because it truly is the best place to go for reasonably-priced but good quality Japanese food in Victoria. It may not compare as well with the best that Vancouver or Richmond have to offer, but in our small market it's a great place to go.
I will attempt to post a listing of menu items.