I haven’t had any issue finding those amenities in hotels in Europe (at least in Berlin, Munich, Madrid, and Málaga, which is not an exhaustive study by any means). I’ve seen a few that look to be entire small apartment buildings converted into hotels, which isn’t great for the local housing market, but all the ones I’ve stayed at were clearly built for that purpose. So that’s the good news, I guess.
I think that’s probably true - Japan has such a sanitized reputation now (which, frankly, isn’t entirely deserved), and most people probably don’t ever take a history class after high school, so a lot of people probably genuinely don’t know how bad it was. I did a little over 3 years of an undergrad history major and never heard a word about it. The only reason I know anything about it is because my AP US History teacher in high school told a few of us about it after a class on WWII. I had nightmares about some of the pictures for a few nights. I see why they don’t generally teach it to kids.
I’m assuming that if the genie is giving you the money, magic will take care of some of those concerns.