The small Ackerl hut is a self-catering hut of the Alpine Club and not managed.
On nice weekends in the summer is usually the hutkeeper on site and sells drinks.
If you would like to spend the night in the hut, you can request the cabin key from the Alpenvereinsektion Kitzbühel.
Here you can find more information: www.alpenverein.at/ackerlhuette