Considering the Akzent Hotel Hohenstaufen in Koblenz?
A VT member wrote the following comment about visiting Koblenz:
St Goar Castle... by CandS
The town of St Goar and the St Goar Castle on top of the hill...
Our cruise up the Rhine was great, we saw some gorgeous towns and seeing all the castles up on the hills was my favourite part!!
We didn't stop at many of the towns along the way but we will go again one day.