It's a hostel, so you're subject to everything that brings. Late arrivals, general weirdness from strangers, etc.
A few qualms from a sensitive person:
Beds are definitely too hard, duvets too thin, green light never turns off, beds shake like crazy when people move about, and there's a big gap between the top and bottom bunks on the wall so make sure they don't air any, say, body spray (or worse).
But if you sleep heavily you won't mind. Operation itself is quite streamlined.