First of all, I recommend a Sushi-bar, which named "Sushi no Sasuke." I don't know if it's famous or not, but this is a good sushi restaurant. I've been there only twice or three times, because sushi in this restaurant is a little bit expensive compare to 100-yen sushi restaurant. So, I forget what this restaurant is like... But I think you will write what you want on a little piece of paper, and give it to the staff. Then you can eat sushi. Please go here at least once!
(I copied the photo from image-search.yahoo.co.jp)

They open everyday except Wednesday from 11:30 to 22:00.
I forget the taste a little bit, but I remember they're delicious, and also fresh! I wish I can go there again sometime.