We stumbled on this place by accident after living in Tokyo for many years! It's conveniently located at the back of the Imperial Hotel - go under the train tracks and turn right, it's located about a 5 minute walk on the rail track side of the street.
Tofuro - does indeed serve great Tofu and a variety of other great Japanese food - it's a great place to sample lots of small dishes of different regional cuisine. We had: tempura, sashimi, tofu, noodles, soup, yakitori & green tea ice cream.
They have an amusingly badly written English menu - but it doesn't include the daily/seasonal specials - so if you can go with a Japanese speaker to get the best out of the menu.