We stayed here as we were going to a VW show in Bad Camberg, it was an easy short trip down the A3 to get there every day.
The hotel staff were as friendly as I would expect, I think if I spoke more German the experience may have been a bit easier. The room was nice and clean and very comfortable after a very long drive from Antwerp to get there.
Breakfast was typically continental which also included cereal, it was enough for me as sometimes a full English breakfast every day can be a bit much.
I'd definitely stay there again and I'd recommend it to anyone who wanted to stay in Diez or the Limburg area.