I was a guest at Karl & Lisas place in Vienna. Upfront information & communication, check-in (you‘ll open the door with a special app!) and the apartment were just awesome. I had everthing I needed and the bathroom was really clean (most important topic for me). Furthermore, it’s very close to public transportation, so it does not male any sense to rent an expensive apartment in the city centre. So, all in all it‘s a 5star place, which I‘d book at anytime again.