It turns out that the host lives in Serbia. According to his neighbor, it is not legal for his apartment to be an Airbnb. Because of him being in Serbia, the communication was poor. We ended up checking in four hours after the regular time. The saving grace was his cleaning lady. She bent over backwards to accommodate us. We left for Salzburg, and I realized I left my insulin behind. I took a train back to Vienna,and she crossed town to meet me at the train station and give it to me. She was an angel.