Karla is an amazing host. She is very friendly, replies quickly and provides detailed descriptions/advice!
The apartment itself is in an absolutely brilliant location. It’s a 2-3 minute walk from Vienna’s metro but most things are genuinely in walking distance and if not (schobrun/belvedere palace) then you can get there quickly and cheaply.
Karla provided a book with recommendations of restaurants/bars/cafes which was very useful, quite a few of which are very near by.
My partner and I had a great time, the only advice I would give to people staying here is not to bother getting a metro pass as you can walk places. And don’t bother paying €16 for the city airport train (CAT), get the S7 express train for €1.70 and it only takes 20-25 mins instead of 16mins!