Originally Posted by
railroadtycoon
<snip> though fitting a family of four is tough. Shoot a budget out maybe we can brain power it.
I've been taking notes of reasonably priced rooms for four in Tokyo recently.
As well as a budget, let us know the dates and the ages of your two children.
I wouldn't advise basing yourselves at the Tokyo Bay Hilton either.
EDIT - Just found this
http://www.newcityhotel.co.jp/eng/
As long as one of the children is under 12 it accepts three adults and one child on the booking - Sundays for 12,600yen, Weekdays for under 14,000yen a night. Locationwise, it's between the Shinjuku Hilton and Park Hyatt. The Park next to this Hotel isn't the nicest area of Tokyo, but it's not actually dangerous in any way.
http://66.102.9.104/search?q=cache:Nh7_5wYGIWgJ:tokyokids.jp/html/hotel.html+03-3356-4605&hl=en&ct=clnk&cd=6&gl=uk&client=firefox-a