End of october and I got the news of hotels and vacation rentals that they are booked up for New Years Eve. In my view Vienna is getting more popular every single year. Everyone is talking about financial crises, stocks falling with no end, but it seems to be always enough time and enough money for a short party break to Vienna :).
It is interesting to see that every year Vienna is booked up and again every year the most booking requests are received within the last two weeks before the arrival. What a pitty that you have to tell all those people that they cannot come to Vienna - or at least find no place to sleep.
I recommend to use meta search engines for free rooms or try big websites with many apartments and make a request that is not too specific. There are still enough accomodations free all over Vienna, but especially the inner city locations are booked up. Personally I would try Hotels or Apartments outside of the Gürtel - that are the districts 15 - 19. With the tramways (driving all night long on Silvester) you easily can get home from the city center in half an hour and the price should be reasonable there.
So if you still need an apartment in Vienna I wish you good luck!