try this one na ka Kaosarn Tokyo. I never actually stay there tho I saw the ad in pamphlet at the airport last time I was there. reasonable price + quite nice location. range starting from 2000 something yen only ka. : )
http://www.khaosan-tokyo.com/en/original/
have fun kub. (some of my friends used to spend the night in Karaoke -__-" just because our hotel was too far to go back and forth to the city each day.)
btw, i'm going to Tokyo again tmr. would u like me to get some brochure of places to go n hotels to stay mai ka? hopefully, it's not gonna be raining so i could eventually go to Mt. Fuji >_<