Hotel Kaiserhof on Frankenberg gasse http://www.abnet.at/hotel/vienna/kaiserh/
Small, cozy wonderfully clean and friendly in an Austrian way. Reasonable business rates.
Hotel Josefshof in the 8th district is nice; small courtyard for al fresco breakfasts in summer. Rooms in the old building are nicer than the new ones!
Close to the university, parliament and council.
The BestWestern in Harmoniegasse is a nice place to stay, not far from the university and city center: http.//www.bestwestern.at/harmonie
Perhaps some of you would like to try an apartment instead of an Hotel?
We provide self-catering apartments in the City Center: http://www.viennacityflats.at