Most people tend to stay in Shinjuku or Shibuya, as both area's are well connected and have just about everything that people want to see. Either way somewhere around the Yamanote line is always recommended.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.