I wasn't informed about how things worked, for example breakfast etc, and didn't feel very welcomed at first.
I didn't sleep all night because someone kept having his phone on with sound and was coughing constantly but the worst was that a half naked man opened my curtain to my bed at night which was very uncomfortable and made me not feel safe.
I complained and asked for my money back as I didn't want to stay my second night, at first I was not approached well at all and felt completely alone in the situation without support from the hostel, after a while that changed and I had some money back with an apology which came too late but at least it came at all!