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budget accommodations in Santorini and Mykonos

I'm 24 years old and heading out to the Greek Islands in September. I was wondering if I could get some opinions on where to stay.. I'll be by myself, so I'm looking for a HOSTEL (I'm on a budget) in a decent location/atmosphere where I could potentially meet some more people my age. I'm going to both Santorini and Mykonos, and possibly Ios. Thanks :)