Everything was excellent. The host enabled an early check in, which was very useful after an early morning flight. The apartment is clean, spacious and very nice overall. Everything in the description is accurate, which is always a plus. The location is excellent - in a quiet area, with a nice walking area next to the apartment, several cafes, restaurants and shops. A U4 and a U6 underground stations are within 5 minutes walking.
The only minor points were TV not working in one of the rooms (not a big deal when visiting Vienna), and one of the guests unable to connect to wifi, which was probably due to her phone. The wifi worked perfectly for the rest of the group!
Overall, excellent experience, and looking forward to staying there again when visiting Vienna.