Bottom line: not recommended.
I have had very good luck with Airbnb rentals in Vienna, having rented there on five separate occasions. As soon as I walked into this flat, I realized my luck had run out.
The flat is more like a boarding house or hostel with separate rooms for separate travelers, each of whom is staying for different lengths of time. By itself, this is not a problem, but if it's a hostel, it should be advertised as a hostel and operate like a hostel with basic amenities for visitors, a common space where people can socialize and get a sense of who else is in the house (especially since some of the rooms are so tiny), and a well-understood set of rules and responsibilities (like who is taking out the trash, buying common supplies, etc).
In my time at this flat, I had to buy my own toilet paper, salt, and clothes hangers -- really basic stuff I didn't think I would need to buy as a traveler, and which made an already inhospitable feeling space feel even less hospitable.
I had no internet in my room for a full two weeks of my stay, which is a major problem for staying in touch while traveling. The fridge leaked and ruined some of my groceries. The whole flat smelled of paint. After I left, another resident of the house said that guests were completely without access to a kitchen for two full weeks while repairs were being done.
The truth is the flat should never have been up for rental in that condition -- if the host was not ready to host, he just should not have hosted.
Vincent was always very polite to me, kindly let me check in early, graciously offered me a different room when I said that the tiny, newly renovated room I had rented smelled too much of paint fumes and was giving me a headache. He also listened attentively when I clearly and calmly told him my issues with the flat.
I hope that he will take those concerns and suggestions seriously and implement changes so that other travelers will have a better experience than I did. If not, I would recommend another flat. Vienna is a wonderful city full of well-finished, affordable accomodations in good locations with thoughtful and hospitable housemates and hosts -- go find one of those instead.