One simple word: awesome!
To start with, the communication was awesome. Constantin's mom Daniela confirmed our booking immediately as Constantin was away. We also did a last minute request to check in a couple hours earlier and Constantin accommodated by letting us dropping off the luggages so we can work around without looking like donkeys.
The place was very spacious, clean, and modern, with two separate seating areas as well as a very nice balcony that we enjoyed a lot late afternoon or early evenings. The beds and the showers were very comfortable, to say the least.
Lastly, location location location! It's right next to Rathaus where you can easily walk to the city center for touristy scenes (not our purpose) or surrounding districts/small streets (less touristy) and playgrounds (for our toddler girl.
This is definitely one of the best Airbnb we got and we would love to stay again here soon!