The Bar/Lounge at Hyatt Regency Koln
The bar/lounge at Hyatt Regency Cologne is praised by professional travelers. Of the 6 publications tracked on TripExpert, 2 referenced the bar/lounge, like Oyster and Star Service.
Hyatt Regency Koln 
Oyster
Star Service
Oyster "The hotel has a main restaurant and a bar with a terrace, as well as an indoor pool, a spa where guests can get free massages, and plenty of meeting and event space"
Star Service "Breakfast buffets are served up for a steep fee, and a casual afternoon tea is delivered in the lobby lounge"
