2 girls, aged 25, looking for acc in Sofia from 15th June till 2nd of August

We are two girls, studying Human rights MA program in Sarajevo and we are comming to do an internship in Sofia from the dates marked above. We are searching for a cheap place as we are with student budget and we have difficulties finding place to stay as it is either expensive or unavailable and we also have some trust issues being foreginers so we would to live with other students if possible and the best option would be a student dorm :) I would appreciate a quick response. Please reply to my email .