Karla and Christoph were wonderful hosts and have a beautiful home with an adorable dog. We were only able to stay 2 nights, but would have loved to stay longer and try out more of Karla's great recommendations. Their home is also in a great location with lots of shops and cafes nearby, otherwise almost all sites and attractions are easily accessible by a short walk or public transit ride. Communication was great and Karla and Christoph are kind and easy going - would highly recommend for visitors to Vienna.