Callejeros Viajeros
Sleep Cheap
An good last minute alternative when staying in Vienna is to do it with a hostel like Wombat's City Hostel.
For 18 euros a night you'll sleep in an 8 person room and for 29 euros a night you can get a room for two. On weekends it costs 35.
This hostel has 500 beds and each day people from all over the world visit this Austrian city.