I picked Renate's apartment because it was walkable distance to the Kunsthistorische Museum, and in fact its location is surprisingly good, despite not being downtown. (That also means it's affordable, of course.) All around the apartment are supermarkets, bakeries and coffee shops, and more restaurants than I could fit in in two weeks.
If you are good with brisk walking, the KHM is about 20 mins away and the Staatsoper is 30 mins away. There are plenty of good restaurants within 10-15 mins, a good cinema with subtitles (Filmcasino) is 10 mins, and if you're there in the Christmas season as I was, it won't take more than a few minutes to find Glühwein...
The apartment is well-appointed: there's coffee (Nespresso), hot water and functional equipment for the most important matters (wine glasses, corkscrew).
For nomads: there's a corner desk, and the internet is good, if not the fastest.
Renate and I missed each other as she had to be out of town while I was there, but this was not a problem. We communicated via Airbnb messages and everything went well; she answered my doh questions very quickly. Renate is a pro.
Tips: Restaurant Stefan 2, right next door, is worth visiting - the grilled tuna was excellent. Zum alten Fassl, about 10 minutes walk, is also a classic local, but you do need to reserve. For serious cocktail lovers, the Stadtbar in town is professional and not too crowded most of the time. Note that bars still allow smoking, which is a shock if you're no longer used to it, but many (though not all) restaurants are smoke-free or have a non-smoking area.
I can happily recommend Renate's apartment, and I hope to see it again one day soon.