22 year old girl looking for accomodation in Athens

I am a Portuguese student currently studying in Paris, but I will move to Greece for the summer in order to complete an internship. I am looking for a small, clean studio with kitchen and internet (Wi-Fi or otherwise), as close to the railway station as possible, to avoid spending money on transportation. I don't have any other demands as far as the studio is concerned, except that my budget limit is 350. Thank you.