Christian's apartment is absolutely wonderful. It is very conveniently located in Vienna and the interior itself is fantastically well decorated and nicely maintained. My friends and I stayed at the apartment over a weekend while we were in town for an event. There were seven of us in total and the apartment was still more than spacious enough for all of us to feel comfortable. We also had the pleasure of meeting both Christian and his wife and found that they are great people and wonderful hosts. I would certainly recommend staying at this apartment anytime you are in Vienna.