Hey Mellita, I have stayed in couple of hostels and beleive me yes it's all safe and also hygienic ... Go on reviews before you book any zostel ... But they are more known and best in the hostel business ... about safety they are safe for sure ... The best would be read all reviews ... share the hostel name which you are booking here on Tripoto forum .. so that you will get the perfect answers and you can go ahead with that ..... Happy Travelling !!!