Sept 17-27 backpack to Greece ( 希臘 )

Does anyone has single backpack experience to this country? And would like share something with me? Because my Chinese typing is very poor, so I used English, you may used Chinese to share with me.

I can't find any cheap (i.e. around Euro$10-25) accomodation at Mykonos and Santorini through internet, can anybody tell me something about this.

Strictly speaking it is my 1st time to have backpack, if any lady also depart with this date, see whether we could cope with something.

Regards