Since the old thread, which is located here
Tokyo Luxury Hotels (consolidated thread -- older thread, now closed)
has been around for more than 10 years and is quite long, I am closing it and opening this new thread for discussion going forward.
RichardInSF, moderator, luxury hotels and travel
Edited to add: As suggested by a number of members, reviews of individual Tokyo luxury hotels were each put in a dedicated thread. Wiki above has links to those threads.