Abenteuerhotels in Friesische Seenplatte suchen

"The Restaurant is good, the room was fine, although the bed was pretty soft. What I found strange: The room needed to be paid upon arrival, so the meal etc. was charged separate. And they ask for a surplus for the Creditcard transactions. Something I never faced before. It isn't the end of the world, but I found a plus of more than 10 Euro for 2 transactions are strange"