We had a lovely stay at Katerina's place in Vienna. The apartment is bright, spacious, clean, cozy, and the bathtub is pure luxury! Although we didn't get to meet them, communication with Kati & Bernd was great. The neighborhood is quite, residential, and nice but not for late nighters. The tram to get to the U is a quick walk and easy to access the city Center within 20 minutes or more. We would highly recommend it!