Hi
I read through your post quick and notice you wanted to stay at sakura house? I can't really recommend this place and the reason for that is because I've only heard neqative respons from people who stayed their. My recommendation is
Khaosan Guest House in Asakusa. I've stayed their my self and enjoyed every moment. Friendly stuff and really good price. Close to locations like Akihabara and Asakusa has some famous places one should visit like the old temple Sensoji!
You should buy the Lonely Planet travel book for Tokyo. It's highly recommended and easy to have with you when discovering Tokyo
Also if you have time and money you should try to go to Kabuki theater in Ginza. I did and it rocked!