I would be careful with his advise on money. If you came to Japan in the past 3 months with no cash and a Visa card, you would be in deep shit. Visa cards are just not working here and it seems nobody cares to fix it. Japan is very safe so it's probably fine to just bring your budget in cash. Also outside of the beaten path like he advise people to go it's still very cash heavy society. Your taxi driver will not be h…
YMMV but my visa worked perfectly fine during my trip there last month.
I still recommend some cash. In many cases cashiers have hard time using foreign cards since there might be prompts they are not familiar with. It's sometimes slow and awkward to pay with foreign cards. But if you prefer it and stay around Tokyo you are 95% fine with a charged IC-card and a credit card.
Actually I have even noticed some places and events in Tokyo do not even accept cash.