We didn't get to know the host in person because the accommodation is autonomous. So it's not a personal comment against the host, but rather an evaluation for the apartment itself. Well, the position is convenient, and the check-in was quite smooth. But everything else were very disappointing. The equipments are insufficient, and the sound isolation is bad. Every other morning (7:00 or 8:00, seriously), there were people doing manual works, they were knocking on something and making a scary noise, we hear it very clearly. And we can even hear next door guy snoring. It's horrible as an accommodation if you're planning to visit Vienna as a tourist. Maybe just for one night is okay, but 4 nights was... we should have rented a hotel...