First the good things: The apartment is newly renovated and nicely furnished. I did not miss anything in that regard. The bed was comfortable for two people and the mattress was good. The location next to U1 Vorgartenstrasse is really convenient. There are many shops and restaurants within 5min walking distance.
On the negative side: It would have been good to know beforehand that the apartment is on the top floor right under the roof (without elevator) and for that reason it gets very stuffy and warm in summer.
At the same time, the windows open into an incredibly loud street - we could not hear each other talk when the window was open and it was a problem for sleeping. We had to get earplugs for sleeping, but even then we could hear the street.
Small things that could be improved:
The curtains still let a lot of light in. We only got one big and one small towel each for the entire week. There were a lot of little flies in the kitchen and sometimes a slight rotten smell in the kitchen - I assume these things could be fixed.
Communication with Daniela could be improved as well. She only told me last minute how we can enter the apartment after I had asked repeatedly and it took her 24h to tell us where to find the WiFi code. It was quite clear that she is running many AirBnBs as a business and there was nothing of the personal vibe that I am normally used to from hosts on AirBnB.
For the price, I would have expected a better experience to be honest. It wasn't terrible, but I would not book it again.