acommendation @ tokyo

hi hi....i will stay in tokyo for 5 day...
i wonder if u guys know any accomendation thats under 4000 yen per night?

did anyone been staying in Khaosan Tokyo?? was its good???

also....how much $ i should prepare for 5 days? ( i plan to go to disney land, have a hot spa( spring? ), and skiing....is 5000 HKD enough??