Gonpach seems very popular for visitors from overseas, especially this branch in Nishi-Azabu as it can accommodate a lot, and is well-known for being filmed for the movie "Kill Bill" back then. Typical traditional Japanese castle-like exterior/interior, traditional Japanese dishes served. You get to experience what "traditional Japanese" feels like by being in there, so it might be nice if it's your first visit in Tokyo. Lunch is available too. Taste is slightly above average, and yet this place is more about its feel of being exposed to Japanese culture.
My rating: 3.5
Gonpachi (Nishi-Azabu branch)
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Address: 1-13-11 Nishi-Azabu, Minato-ku, Tokyo
Access: 13 minutes from Roppongi station
Budget: 1,000 JPY (Lunch), 4,000 JPY or more (Dinner)