Considering the Guennewig Hotel Bristol Mainz in Mainz?
A VT member wrote the following comment about visiting Mainz:
St. Quintin's by yooperprof
I haven't been able to find out about this historic church in the city center - except for a Wikipedia article in German! I do know that portions of the church date back to the 14th century, although the church was heavily damaged in World War II and then almost entirely rebuilt after the war.