Caroline and Martin are great hosts, who help with whatever you can imagine. Check in was very convenient and flexible. The apartment was gorgeous, spacious and exactly as advertised. The inner city is within 10 minutes walking distance and public transport is available just around the corner. Having a stocked fridge in the morning after arrival was great. Their "Vienna Guide" gave us very valuable hints for the best "Schnitzel" and the best "Konditorei" we never would have guessed otherwise. Put short, staying at their place is truly an amazing experience in one of the most wonderful cities in the world!