If I do make it to Japan like I have been planning to, I would definitely like to check out the Claska hotel. It looks ridiculously clean and calm. The 21 rooms are designed in 5 styles: modern, tatami, contemporary, DIY, and weekly residence.
The Modern:
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The Tatami:
 
The Contemporary:
 
The DIY:
 
The Weekly Residence:
Images via Claska.