The costs of living in Berlin are different for every person. The advantage is that if you are from another European country than Germany you are entitled to an Erasmus + grant if you do your internship in Berlin. Students are able to live more than fine with the following expenses.
Rent: € 500,-
Subway membership: € 40,-
Food: € 400, -
Remaing: € 100, -
Total: € 1040,- per month