Great experience staying at Christoph's place. The room was quite large and bright. Everything is clean. The location was perfect, which was just a few minutes' walk away from a metro station.
Christoph was on vacation on the day we arrived, but he still arraged everything very well. The information about the restaurants nearby was quite useful. We left in the evening of the last day and he even offered a late checkout.
I would recommend everyone to stay here when comming to Wien!