Corinna is a great host. She was unfortunately not in Vienna at the time we visited, but she arranged for us to have everything in place. Directions were perfect, and also the timing. She has a wonderful apartment, within walking distance from the center and located in a very nice area, full of little bars and restaurant. The house is exactly how it looks in pictures, I'd say more beautiful even. She left two Mozartkugeln and also a little bottle of wine as a welcome. She has plenty of maps and books on Vienna which are really useful and she also drew a map herself of her neighborhood. The energy of the apartment is great and it is easy to make yourself at home :-)
I would definitely recommend it, and if I ever come back to Vienna I would surely stay at Corinna's house again :)