I took a quick look at the site; here's some basic info.
They plan to open mid-late April 2008 for the season. Hours are Monday 12:00-18:00, Tues-Fri 10:00-18:00, weekends and holidays 9:00-20:00. Cost is 20 euros for the first dive, 10 euros for subsequent dives. Reservations are recommended, since they limit the number of divers at a time to reduce crowding. Vis can be up to 15 meters, depending on conditions (current vis information is available on the site when they are open).
There are liability forms and rules on the site. Buddies are required.
Hope this helps a little. If you need more specific info, I can try to find it, since I read and speak German. If you e-mail them in English, chances are someone there can help.
Deborah