Avoid this property, do not stay here. In 20+ years of traveling these are the worst people I have ever encountered anywhere in the world. The apartment is a health and safety hazard and should be closed down. All windows are locked so no way of ventilating the property, the heating on MAXIMUM 24 hours a day, unable to breathe or sleep, they then lied about an engineer coming to fix the problem and then accused ME of lying about there radiator having a control valve, finished off by fabricating a photograph after I had left!
They have refused any kind of modest compensation and refund, resulting in a court case.
Terrible, horrible people who do not deserve your money. There are some lovely apartments run by lovely people in Vienna, this is not one of them.