I've just Visited an Italian restaurant named Trattoria Tanta Bocca in Yoyogi district in Tokyo.
I went there because they serve A5 Wagyu beef, the best beef that you can buy in Japan. In Europe you usually only hear about Kobe beef, and Kobe beef is usually A5.
The beef was so great so that I almost wanted to cuddle with it. The price was also very good. Had a bottle of good wine, A5 Wagyu for two, and two desserts with Espresso, and only paid 16000 JPY (1350 SEK/150 EUR/200 USD). That's a bargain for A5. Ialso enjoyed the relaxed atmosphere of the restaurant. You don't have to dress up, and you don't have to book weeks ahead if you show up early. They open at 18:00 (6 PM).