Vienna is an expensive city, when it comes to accomodations and eating, but something centrally located helps a lot. We were quite happy with the place, and afterwards friends of mine have also stayed there and they were very pleased. Just remember that it is cheaper to book a twin room than a double, and that weekends can be difficult.

You can see it at : http://www.karntnerhof.com

and you could book it using Nethotels ( http://www.nethotels.com ), or from the Vienna Tourist Office ( http://info.wien.at ), where you can do also a search for more places. Just check that they are near the city centre. It helps a lot.

Rgds, Covadonga in Bilbao (Spain)