Looks like they are a booking agent, using other companies to provide the actual transportation.
Did you consider going by train? There are direct trains from Vienna to Passau.
we prefer a car waiting for us and taking the whole group together right to the hotel in Passau.
If they are a booking agent - should I not rely on them?
Another possibility would be
Do you know this company? Any experience with them?
For such a large group a bus transfer surely is the most efficient solution, nonetheless I would check prices with Austrian Railways ÖBB (www.oebb.at/en). You can easily get to the train station in Vienna by express bus (~8€), trains from Vienna to Passau run every two hours and use modern ICE rolling stock. If your hotel is in the center of Passau, then you can probably walk there. Just a thought!
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