Thanks for pointing me in the right direction - I had given up on the room-description and only looked at the description shown during the booking-process (i.e. when you click on "Room details" when making a reservation), and that says:
Special Benefits
Open: Mon-Fri
Closed: Weekends
So I assumed they have a lounge, yet the obviously missing Concierge Level room made me wonder. But thanks for reasuring me!
Greetings - Dirk