There is a whole team of people that responds to Airbnb messages, so the response time is blazing fast!
We spent almost two months in Vienna and it was a pleasure to stay. The apartment is located just 3 minutes away by walk from Rennweg, where you can use trams (O, 71), buses, and REX/S-bahn and navigate through Vienna easily. You may also choose walking to Vienna Opera (30 minutes). We also enjoyed spending our time in Belvedere and Botanical Garden (on the way to Belvedere), which are within walking distance from the apartment.
The apartment has everything that you may need during a long stay. The apartment is not that well-lit as it appears in the photos, but it is not too dark either, so it was fine for us.
The internet connection was fast and stable.