Considering the Pension Frickinger in Passau?
A VT member wrote the following comment about visiting Passau:
Conjuction point of the rivers Donau, Inn and Ilz by himalia11
There are three rivers that join in Passau: Donau (Danube), Inn and Ilz. From the fortress, you have a great view on the conjuction point. Normally you can see the different colours of the rivers, but we've been there during floods and all rivers were just brown and you could only see than the Inn was faster! Also, we couldn't go to the conjuction point in the old town because it was under water, but I'm sure that it's a nice place!