We have used Airbnb places for several years all over the world. Staying at Harald's place set a new standard for us as to what a great lodging should be. Harald gave accurate descriptions that were fool-proof, he offered suggestions regarding events in the city that we might (and did) enjoy, he was incredibly responsive (he almost answered before I could ask), and we spent several hours discussing just about everything we could. Harald's apartment was super clean, close to transit stops in several directions and had all the amenities we could ask for. The bed was super comfortable....I wanted to take his bed with me, but it wouldn't fit into my suitcase. The apartment itself is cozy and comfortable. The Wifi was fast, it was situated in a good part of town with grocery stores and restaurants just around the corner. Harald, Karolina and Mango were warm and hospitable and patient with us. The next time we are in Vienna, we hope this apartment is available again.
I wish there was an Airbnb category for Super-Duper host, because Harald, Karolina and Mango are the best hosts we have ever encountered. Especially Mango.