We unfortunately have had a terrible experience with Vienna Stay Apartments. After a flood in the apartment we originally booked, the host moved us to another apartment. The apartment we booked was in the centre of the city and huge. The apartment he moved us to was tiny and miles out of the city centre. We accepted to move as it was past midnight, we had nowhere else to stay, and he was visibly stressed and we did not want to add to his stress.
Halfway through the night at the new apartment, there was a false fire alarm that woke up the whole building. It took the host over 30 minutes to arrive and switch it off. When he arrived he was unbelievably rude, not acknowledging any of his guests or apologising for the inconvenience. What's worse, I understand from some guests who rang the fire brigade that the fire alarm system is not connected to the local fire brigade such that they will not come if there is a fire. Apparently it is a legal requirement that this system is set up but I was informed that the building we were moved to did not have this system.
Upon arrival home, I contacted the host to request a refund of the difference between the cost of our original apartment (EUR 167 a night) and the apartment we were moved to (EUR 49 a night). He refused and offered us a fraction of the difference in compensation instead, arguing that it was not his fault that the original apartment flooded and that we agreed to move. As explained above, we had no choice but to accept to move and clearly it was not our fault either that the original apartment flooded. I pointed this out but the host point blank refused to refund us still, expecting his guests who had paid for a service that he could not provide to pay the cost of the flooding instead. Despicable.
The apartment was fine but my advice would be to steer well clear of Vienna Stay Apartments. The host clearly has no regard for his guests whatsoever and only cares about making money.