We (my mom, sister and I) can only confirm what everyone else has already said: this is an excellent AirBnB!
The apartment itself is very clean, stylish, has all the amenities (hair dryer, dish washer, …), comfortable linens, plenty of towels, … Plus, it’s not in the super touristy area yet you can get everywhere on foot.
Johanna (Johannes’ daughter) answers quickly to all your questions and is an excellent host. My mom forgot some clothes in the wardrobe and Johanna immediately put a package in the mail for us. We will recommend and book again when in Vienna!