An absolute gem! The location is fantastic - right in the museum district, several public transportation options within walking distance, and lots of grocery stores nearby. The apartment is located on the 3rd floor, but there is a small elevator should you need it for getting your luggage up there. The kitchen is well equipped - I was able to make several full meals. The rooms are all well decorated and cozy, and the bedroom features a storage unit for organizing your clothes. Wifi was reliable (I work remotely), and I always had hot water. The dishwasher and washer/dryer were also much appreciated for a longer stay.
I had originally intended to stay for 4 full weeks, but Austria went into lockdown just as I arrived, so I only stayed for 2 weeks. Daniela made it a point to check in throughout my stay and was very flexible with my change in plans.
10/10 would recommend - you won't regret it!