Through 2010 and 2011 I have been on the following properties without any questions or trouble with FF rate:
Radisson Blu Carlton Hotel - Bratislava
Radisson Blu Park Hotel - Dresden Radebeul
Radisson Blu Alcron Hotel - Prague
Radisson Blu Hotel - Lisbon
Radisson Hotel Narita - Tokyo (no breakfast, free shuttle to Airport)
Park Inn by Radisson Berlin Alexanderplatz - Berlin
Radisson Blu Royal Hotel - Brussels (got upgraded after they allocate me an already occupied room!!!)
Park Plaza Vondelpark - Amsterdam
art'otel budapest, by park plaza - Budapest
All stays with breakfast included (except Narita), best one in my opinion got to be Radisson Blu Royal Hotel in Brussels.