Everything was great for us in Miriam and Philipp's apartment. Clean, spacious in a charming building and super well located to walk to many places and very well connected to the rest via public transport. We found it surprisingly quiet despite being very close to the center; it was extremely hot in Vienna during our stay and we could sleep with the windows open without being disturbed by any noise or traffic.
Unfortunately we couldn't meet Miriam&Philipp in person because the where away while we were there but they gave us super precise guidelines to do the check in by ourselves without any problem. During our stay the were very available via chat to answer any question or give us recommendations.
In summary, very recommendable accommodation and hosts!