This place is in the middle of the Tsukiji Fish market (that's at least the one we went...not sure if I chose the right place for feedback...there's several entries!).
Mostly there's a line in front of the place, but it's moving fast and it's surely worth waiting for. Inside there's loads of tables on two floors and also counters. We preferred the counter where you can watch your sushi being made.
It's a great place for good sushi, but there are also other items on the menu (like Fishhead, Tempura etc.). But of course it's all about Sushi...and it's really great. We've had lots of Sushi on our Japan-Trip and this surely is among the top. The best choice here is the Tuna. Raw or slightly broiled...both great! There's lean Tuna, medium-fatty and full-fatty. The medium and fatty Tuna were my favorites. Best Tuna we've had in Japan. Other kinds of sushi are fine too, but the Tuna is standing out. The only let-down here was the Salmon. We've had lots of better pieces of salmon than here, it's just to lean and not really good flavoured....no need to order it.
But besides that Sushizanmai is a MUST if you're in Tokyo. Tuna is King here! Order a sampler (with three to six different pieces of tuna), which is a lot cheaper than ordering them piece by piece.
Wanna know more about my travels? Check my profile (with a link to my website).