They said that they never received a notification or confirmation from Hostelsclub concerning the booking. We ended up having to pay way more for accomodation than we wanted to.
It was a small amount but I had to pay bank charges on top of the deposit. I also had to pay a service fee once they reimbursed me which means that I was out of pocket for their mistake.
They did pay it back though (minus bank charge and service fee) and were very apologetic. It looked like a nice place from our view at the reception desk.