There must be people who'd get as excited at staying somewhere with the name 'Naruto' in it as others would be in going to somewhere called 'Skywalker' resort - just as well your interest was more pragmatic, it would be horrible to have to let a young teenager down.

A FTer with the handle SuperCarnitas pointed out this link in another thread
http://www.marriott.com/rewards/part...ll&elite=false - but the New Otani partnership just ended, so no use to you. Sorry.

I'm aware of the location of the Ginza Marriott - it's a pretty good one. I've not stayed there though.
Encouraging comments from this thread
http://www.flyertalk.com/forum/showthread.php?t=775283
Suggest that all the rooms will have been renovated by now.

Seems like an excellent choice to me, especially if you have certs.