Marc - don't know the answer to your question but perhaps you should post this to the Japan Forum on Flyertalk ( http://www.flyertalk.com/forum/forumdisplay.php?f=509 ). All I can say is that make sure you get commitment for housing in writing - both location and all the specifics (size, bedrooms, bathrooms etc).
🚢 Cruise with your favorite Keene Luxury Travel Staff Member! 💰 5% KLT Reward plus Shipboard Credit available (amount varies per voyage)! 💲 Offering Enhanced KLT Rewards on voyages hosted by Ngaire & Clay!