The hotel can be found at rakuten travel

Or at expedia at┬«ionid=6162375&startdate=2017%2f11%2f22&enddate=2017%2f11%2f25&rooms=1&_xpid=11905%7c1&adults=1

Booking at:

The location of the venue is at Ichigaya, Tokyo. So you can input the location, the dates of the stay and the budget to get to know the right hotels for you.
There are lots of restaurants and convenience stores nearly as well.

However, if you wish to book hotels by yourself, you can find near-by hotels from the venue through Agoda or Expedia. But, to get better deal, we recommend you to book early as Tokyo has been quite popular destination for foreign travellers recently.