FWIW. Very Germany-centric.
Frankfurt airport was very good.
Hilton. Mainz. Excellent breakfast. (Can't recall if that was in general or only executive.)
Hilton Munich Park. Just ok but nice basement spa and pool.
Hilton Munich City. My favorite. Wonderful food and drink. In two days I ate and drank there rather than ate out. Drank all their gin!
UK. ok
Paris. ok.
Can't think of anything memorable in the US sadly.