19 years old summer intern in Montpellier is looking for accommodation for 2 months

I am an undergraduate student of biology from Greece and I am to fulfill a summer internship at a research center in Montpellier. The only problem is that I do not have any accommodation there! I need accommodation for 2 months (August and September). 

I am quiet and clean and I need a peaceful and clean environment too, with internet access if possible. 

I cannot pay more than 350€ per month as I have to cover my living expenses and my flying tickets there, apart from the rent.

My phone number is greek so you have to add the national code before it, which is 0030 (or +30) .