I'm going to Tokyo the first week of April for the first time. I haven't yet booked a hotel and was looking for a suggestion as to the area I should stay in. I would prefer a busy area that is conveniently located to sightseeing attractions and entertainment areas. Could anyone suggest an alternative or two? I'm thinking about Roppongi or Shibuya. How do these two areas compare to each other? Thanks for any advice you can share!