Considering the Hotel Koenigshof in Bonn?
A VT member wrote the following comment about visiting Bonn:
Rathaus by Sjalen
Where there used to be a Gothic medieval building, there is now this lovely old Town Hall which was finished in 1738. The city has of course long outgrown this one, so the Council now has offices in an ugly high rise building at the beginning of Oxfordstrasse, but distinguished guests are still entertained here when visiting Bonn. The most famous event is otherwise when Theodor Heuss, the first Federal President, was elected in 1949, and showed himself to the citizens of Bonn on the lovely outer staircase. You can visit the town hall from May to October on Saturday mornings when there is nothing else going on.