Copenhagen does not appear to be listed in any of the three Marriott categories, on the British Airways On Business Award Voucher offer

European Classic Award
European Signature Award
European Premier Award

Malmo in Sweden is offered, and as a Premier category despite being cheaper than the Copenhagen (room rates approximately £167 compared to £224)

The points required are 2,000 3,000 and 4,500 respectively therefore the value per point is 3.7p which is very low compared to a value of up to 27p for flights.