Positive: Sven is very easy to communicate with and very responsive. The space is large with high ceilings and quite central. A nice small bedroom and a larger bed in the open area. The fireplace is a lovely touch especially during cold nights. There were flowers and candles -which we liked. There are pay-as-you-consume drinks and snacks available for guests if they wish.
Negative: By our standards the apartment was not clean. Thick layers of dust in many corners, a sticky floor, trash not taken out, unwashed cutlery and the kitchen was very sticky.
Recommendation: hopefully our experience was an exception but I suggest communicating clearly upfront with Sven about your hygiene expectations.
Other than that - the place can be recommended and as mentioned although Sven could not fix the issue (and we did not find alternate accommodation that would be suitable) he did suggest to let Airbnb see if another apartment could be found as a replacement.