We went to a YHA place en famille two years ago and had a brilliant time. Friendly people, chats over breakfast with other families and DC really enjoyed it.
We went back to the same hostel in half term, and another one, and it was just so different. Unfriendly people only thinking of themselves, noisy at night and not caring that other folk are asleep when they come back to their room, and just a general free for all with the DC allowing them to make as much noise as they wanted at 6am. 
I hated it. What's happened? 