Via couchsurfing you can find accommodations at other peoples home for free.
Explanation from wikipedia: Couchsurfing is a neologism referring to the practice of moving from one friend’s house to another, sleeping in whatever spare space is available, floor or couch, generally staying a few days before moving on to the next house.
Airbnb & Wimdu
Those are two other rather cheap alternatives to hotels and couchsurfing. The deal is to rent a private appartment, flat or house starting at a price of 15€ per person and night.
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Youth hostels in vienna
Since the AniNite is easily accessible from anywhere in vienna there is a vast amout of youth hostels that are available for you to sleep at.Via hostelworld you can have a look at the long list of hostels. You do not need another ticket for public transports, a Zone100 ticket will be enough to go to AniNite from anywhere in vienna!
Homepage: Youth hostels via Hostelworld
This is a small list of hotels near the event location MultiVersum. You can find more hotels on booking platforms like youthostel.

List of hotels

Boutiquehotel hein ****

Arion Airport Hotel

Das Reinisch

City Hotel Albrecht

Rothmühle Schwechat


All statements without guarantee. Status updated: 25.05.2015