First the negative things:
There very friendly check in Person unfortunately was almost an hour late.
The apartment was not completely clean, the floors and the furniture was definitely not thoroughly cleaned for some time.
Positive:
The online help line worked by whatsapp, was really helpful and answering fast.
The location of the apartment is amazing and you can basically reach nearly anything by foot. 2 metro lines are literally next to the apartment.
The interior design is very interesting and all in all it was a pleasent stay.