Hello Babyboo
When are you coming in December? If you're going to be here around Christmas time, it is very different to back home. There are still lots of decorations but there is little else Christmasey about it - that's just a heads up for you.
If you're here over the New Year period that's a different story. This is a major event on the Japanese calendar and you need to book in advance if you're traveling across Japan at this time. Why? Most of Japan will be going home at this time so seats on trains fill up. You can see more about it at
Japanese Calendar | TokyoTopia | National Holiday Events and Dates
Tokyo is my city and I love it. I've lived here since 2001 so if you want to know anything about it just drop me a line. Take a look round my site too. I've tried to put info together that will be useful and help you decide what you want to do.
Happy planning