I asked for a rollaway for the living room !
The bartender told me that 18 years ago the hotel manager took the decision to install air con in the rooms, without having permission to do so. When his plan got found out the air con upgrades got stopped and that is why not all of the rooms have air con.
I would like to send the former GM a thank you note for pro-active measures ! Looks like he was ahead of his time !
BTW: If I click the SPG link, the German website states that the hotel has "rooms with air con". Looks like the assumption that ALL rooms therefore have air con is incorrect. It means SOME rooms have air con....others are just a CON !