Had a wonderful 6-hour tour with Kei. He is knowledgeable, friendly, eager to showcase Tokyo, and prepared to customize the tour to your heart's desire. For me, it was an excellent way to get a bigger picture view of Tokyo, while also exploring some of the off-the-beat-path neighborhoods. Great to do this at the beginning of your visit, as there isn't a better way to learn the Tokyo subway system than with a local. Highly recommend.