Harold's place is absolutely amazing! After doing a lot of travel in Europe, we think this may have been one of the best Airbnbs we've stayed in.
To start, my wife and I had a major problem at a different Airbnb that we were going to stay in, so we had to switch quickly. Harold accepted our request the day of and made special accommodations so that we could check-in at a convenient time for us. He gave us a wonderful tour of the place, answered any questions that we had, and was overall pleasant and polite.
The place itself is awesome! It's very clean, has a sleek vibe, and is in a great location. We were just minutes away from a major metro stop, so we could easily get into the center. The apartment is super spacious, and he makes sure to have more than just the basics to ensure you're really taken care of (e.g. soaps, lotions, laundry detergent, etc). Additionally, the balcony has an amazing view of the city, so we enjoyed a couple of meals out there.
Harold is an incredible host. He was so responsive to our questions and requests and genuinely seemed to care about our well being. He also really goes above and beyond to make sure that our stay was amazing (like stocking the fridge with some delicious snacks). He also gave us a gift card to his killer bagel shop, so we enjoyed a great breakfast in Vienna!
Bottom line, STAY HERE. Your Vienna experience will be greatly enhanced :)