This was a last-minute choice, but I'm very happy I made it. The apartment was spacious with a large bathtub. The bed was quite comfortable. Access was easy with good communication beforehand. Location near the Hbf is great. The only things worth compalning are 1) the Wifi was very bad. There were two of them: the first one was slower then 1 Mb/s, the second one kept dropping off, so I had to use my own mobile hotspot for working. 2) The sofa wasn't the one shown in the photos, but a grey one with a fabric cover. It was comfortable nonetheless.
I liked the apartment so much I checked if I could rebook it for a later part of my trip, but unfortunately it wasn't available. Next time I'm coming to Wien, I'll probably check this one's availability first before considering other options.