Maybe it was accidental. You get to the hostel and oooooops: the receptionist tells you that you are staying in a 6 person mixed-dorm hostel. OR maybe you really wanted to stay in a specific hostel and the only option was to stay in a mixed-dorm hostel. OR it was just cheaper. I have stayed in quite a few mixed-dorm rooms and I have some tips that helped me feel more comfortable that you can try out!