Very good deal if you happen to go to Seoul or Japan between now and end of Aug.
But make sure you have flights booked before you book hotels because these are non-refundable.
Tested on 21st of July to 22nd of July on Hilton Tokyo Bay for 2 ppl -> 17,500 yen ~ AUD$185
Tested on 7th of July to 8th of July on Millennium Seoul Hilton Hotel for 2 ppl -> 140,000 won ~ AUD$148
or 160,000 won incl. breakfast.
Normally, I don't recommend travelers having breakfast at the hotel especially when they visit Japan or Korea because there are so many (better) things to eat but for another $10 pp.. why not!
FYI - Tokyo bay is bit far from city centre. Millenium Seoul Hilton is close to city centre.
Offer is subject to availability at participating hotels within the Hilton Worldwide portfolio in Japan and South Korea. Book between June 2, 2pm, 2014 and June 5, 2pm, 2014 and stay between June 3, 2014 and 31 August, 2014. Full non-refundable prepayment required at time of booking. Your credit card will be charged immediately for the total amount quoted for the entire stay as reserved and refunds or credits will not be issued. Charges cannot be applied to other stays, services or merchandise. Booking cannot be changed. Blackout dates may apply and vary by property. Additional restrictions apply. This offer may not be combined with other select promotions, offers or discounts (including Hilton Premium Club Japan) and is not valid for existing reservations or groups. Rates are exclusive of all taxes, incidental charges, gratuities and resort fees where applicable.
Have stayed in the Tokyo Hilton and highly recommend it!