I've booked the place about 1,5 months in advance relying on a very detailed and charming introduction of the flat owner, Marcel, and taking into account few positive reviews left by previous guests, not to mention the pics of the flat which looks very clean and neat on them.
Since the very booking attempt and till the moment of my check-out I was in touch with people from Airgreets, not with a flat owner who's currently traveling. The thing you have to bear in mind in such cases: those people always act and speak on behalf of the flat owner and they don't represent your concerns in case anything happens, you have to directly contact Airbnb support team if you have any complaints and objections regarding accommodation which I didn't do in my case and it was a big mistake.
Objectively speaking, everything went very smooth and clear till the very moment of check-in. Once we entered the flat the only noticeable cleaning part were changed bedsheets and towels left on the table in the living room. The rest looked like it remained without cleaning for two weeks at least (in some areas - for months) with lots of personal belongings left in bathroom and living room either by the owner itself (including the wardrobe where you won't be able to leave your clothes, so just keep them in your luggage till the day of check-out) or by previous guests (which is not ok as well).
I have to note that I was charged a decent amount of money as a cleaning fee and even sleeping in a flat which wasn't cleaned properly for weeks it's not the most negligible thing you may disregard while being on vacation.
"Smoking is prohibited", but the smell inside the flat said it was not at all since we couldn't get rid of it for two days for sure.
I've immediately taken the pictures of what I was forced to live in and asked people from Airgreets to solve the issue and clean the flat as soon as it was possible. I also have asked to help us with wifi which was promised by an owner, but didn't work for the whole period of stay on none of four devices we had with us and we spent about 25€ on the mobile internet instead.
The only help I received from the support team was messages full of condolences and their attempts to help me. Which didn't happen. Lamentably.
Another thing I have to note (which isn't an owner responsibility to fix it, but it's my right to inform you) is related to the building itself: it doesn't look neither safe, nor clean (people leave their trash wherever they feel ok) and in the evenings you can experience lovely odours all over the place.
The most important part is that the flat owner has denied my request to make cleaning fee and wifi absence refund without providing me with any decent reason. So I am still trying to sort that issue out through the Airbnb support team.
P.S. On the positive side: there's a very nice view to the opposite side of the street since the flat is located on the fifth floor plus good and thorough wet cleaning right before each guest check-in would eliminate all the issues I described above. Public transport stops are in a very short distance and there's plenty of supermarkets and pharmacies around and a shopping center at the closest S-Bahn station Gesunbbrunnen.
Hope my feedback will help to rectify situation and people who want to book this place won't be forced to experience what I did while having my vacation in the city of Berlin.
But currently I can recommend this place only to those who don't care about their comfort and what they spend their money on.