Located in the agglomeration of excellent restaurants encircling the Tokyo Skytree. An opportunity to eat in this establishment should not be missed. You have to read this if you are planning to visit the Tokyo Skytree.
Sushidokoro Yamada doesn't appear to want foreign customers, claiming to be full many many weeks in advance so as to avoid accepting the booking. Wanted to point this out, since this web site's intended audience is foreigners. Maybe others will have more luck securing a booking, but this was my experience.
1) I think that it is better to wait outside until the time of your reservation, because your table is not likely to be ready before the time of your reservation.
2) It is not impolite, so please do so without worrying.
3) I do not think that is a problem at all. There are some sushi chefs who do not pay much attention to foreign customers, so it may be a good strategy to present your sushi chef with a small gift and make him feel that he has to accommodate you properly.
"Hatsune zushi" is a two-Michelin-star sushi restaurant that's popular with foreign tourists as well, but the wife became seriously ill (with what appears to be breast cancer) and there was an announcement on facebook that business operations will be suspended indefinitely. It's very sad news and I hope to see the lovely couple back at the counter in full health.