Could be somewhere along the Mosel river.
Not really, but one can stay there for leisure (also) reasons.
Not Mosel, Walter, but not that far.
I'll exclude Switzerland.
You can exclude France also, Satt.
And Italy, McT.
So, Germany. Rhine?
Far across the deep blue water
Lived an old German's daughter
By the banks of the old river Rhine...
Czech or somewhere nearby?
No, Dutchy, but the river there has the same number of letters.
That's far from Mosel, Dutchy. No.
Not Bavaria or river Main.
Well, Nahe would be my next guess.
(The following then Ahr and Saar :wink: )
Exactly, Satt!
And the Schloss is now a Kurhaus...