My girlfriend and I spent 4 days in Vienna and absolutely loved Roman's place. Check-in was a breeze and we were given some great information to optimize our time.
The apartment is very spacious and comfortable, with many amenities and a great retro theme, lots of detail went into it. Location was great to explore the city center, as well as the other areas around Vienna. We were able to walk, or get a quick uber, to most major locations including the wonderful Christmas markets. Definitely recommend staying here!