We stayed almost 6 months in this apartment, and everything was perfect.
First, the building is from 2013, so everything is clean and nothing is wrong.
Second, the apartment was like if it was not an Airbnb. It is important for a long term stay to feel at home and not in an Airbnb. So this was an excellent point to us.
Third, Helmut is very kind, communication was easy and he helped us when we needed him.
So it's definitely a perfect place to stay for a long term period!