When we got to Michael's place, we got started on the wrong foot since there was some issue with the toilet.
However, Michael was super responsive and took care of everything and made us happy. We can judge a host not by how things are when it's going well but more so when things go sideways. From that point, I can only rate him 5* since he's a top host.
His appartements in Vienna are well located, clean and renovated!