Looking for info at the Kletterzentrum Flakturm wall in Vienna

Does anyone know if this wall is currently open and if they can provide a belay? I'm in Vienna for a short stay with non-climbers, but this wall looks too unique to skip!

If anyone comes across this post because they are looking for similar information, here is what I can tell you:

-There is outdoor bouldering and a very, very tall top rope (~35m).
-The Kletterzentrum Flakturm wall is crazy.
-This tower was constructed by Luftwaffe to defend against Allied air raids during World War II. It has since been re-purposed into an aquarium and outdoor climbing wall.
-If you climb a route that passes by the balistraria/turret style window, take a look inside and you may see fish swim by!

It is currently open most days from 2PM-10PM and they do rent gear.

See some photos at: en.wikipedia.org/wiki/Flak_…