I stayed for 1 month in the said apartment. I should mention that the host manages several apartments in the building some of which are identical. I was staying in the one on 2nd floor until I had an issue with the heating. The host quickly offered me to move to the same apartment one floor higher.
The apartments are clean and well-designed. Overall I would say this is a great apartment for short stays, but not ideal for extended stays of over a week or if you want to use it for work: there is not enough desk space, just one small table which also meant to be used for dining. The wifi is shared between a number of apartments in the building and is quite unstable (the host kindly provided me with a wifi extender to improve the signal, but this doesn't change the overall bandwidth). The host responds quickly to urgent issues, but otherwise the communication could have been faster. I suppose the host is busy managing all the apartments at once. Also, before booking a longer stay the future guest should agree on regular cleaning as the apartment has no cleaning utensils. Further, as I moved in, there were a couple of plumbing issues in the bathroom, and I wish the appliances had been checked before hand.