Thanks both. I'll see what rates look like a bit closer in. At the moment the D8 doesn't pull rates for next year May yet though I can always do the CP or IC on our corporate rate. While I don't mind saving some €, rates at either of the three properties will be fine.

We'd be coming in via Railjet from Vienna (and then take a cab) and not be at the hotel that much. Still considering the IC as my wife can get to see the Riverview and it will be easy to get 4PM check out which could come in handy for a fresh up after some morning sightseeing and before catching the train back to Vienna. Oh well, decisions, appreciate the pointers.