Thenkyou that is really helpful, I will add it to my list.
The reason I mentioned Tokyo Dome is that, as my trip is already quite full I would probably have something else planned for the morning(maybe Harajuku for example), and Tokyo Dome in the afternoon, and if it is worth not going to the dome and going to Shimokitazawa instead.
I think I have decided tht there isn't that much at the dome anyway, so it will be a good swap out
