We arrived Berlin the morning but could only check in at 4pm and no exceptions could be made when we asked Steffi about it. When we arrived, there were 2 households with the Wlocykz surname and we randomly rang their doorbells to get the keys. The house was clean and tidy when we arrived but no towels as advertised. The kitchen was well equipped and the bathroom was superb. On the downside, there were no washers and dryers and we couldn't find any laundromats around.
The neighbourhood felt a little sketchy especially at night, not recommended for female travellers or solo travellers. However, it was convenient for us to travel around with 2 stations within 5 mins walking distance of the apartment: Seestr and Neuer Platz.
We didn't meet Steffi at all and I believe this was part of the arrangement as the keys were received and passed via the neighbour. If you're looking for a unique airbnb apartment with a German experience then perhaps this apartment is not for you. Steffi always replied within a day and she does what is required but little more. This made the airbnb experience felt very transactional and impersonal.
All in all, nice apartment but the experience was nothing special.