Welch -this is in Kyoto rather than Tokyo, so not sure how you are open to that.
I haven't been, but I was actually doing research for an article on Asia's most romantic resorts (so just going by information and photos and what I felt about it really):
http://www.aluxurytravelblog.com/201...antic-resorts/
Would love it if you could try out "Hoshinoya Kyoto" for me and do a review! I think this may fit your requirements:
http://www.kiwicollection.com/hotel-...oshinoya-kyoto
Give it a try and most certainly do let me know if you do!