U vodnika
This is a great place to stay...located next to the Vltava River, which flows through town (look for a street below Rooseveltova at the bottom of the hill on the right).
There are two four bed dorms and I paid $8 per night. As with most hostels, cooking facilities are available here but with food so inexpensive in the Czech Republic, I chose to eat at various restaurants. There is a small library and a pleasant garden in the back. The owners are friendly and very helpful and will take the time to share ideas on places to go and see.
The place was quiet and my fellow travelers were respectful of "quiet hours".
From journal Cesky Krumlov-A Treasure to Behold and Experience