We loved our Air bnb. This was our 1st time using this service and based on this experience look forward to using it again.
The carriage house is just as advertised. I loved the massive windows with the sheers, there are privacy curtains as well. It felt as they we had our only little apartment in the Berlin area.
The apartment was clean, had everything you'd need and was in an excellent location off the U train.
The instructions for the place were in German, so hopefully we did everything per the rules (garbage, linens etc). Having those in a couple of languages would be my only suggestion.