Last time I went to Gonpachi with my colleagues in Tokyo (our office is at Nishi-Azabu) and it is nice. The lunch set is great and not expensive at all (Tokyo Standard I meant)
http://www.gonpachi.jp/en/nishi_azabu/home/location
And we have Japanese BBQ somewhere near by for the night, but that one is like 100 USD per head .....