We've stayed here for two weeks and couldn't be happier.
Katja and Bernd were super friendly and helpful. The apartment's location is great, public transportation is nearby.
Everything was as described and despite the cold temperature, it was warm and cozy.
We had everything we needed and the kitchen especially was fully equipped.
We did work remotely from the apartment and the internet connection was unstable at times. Having said that, it wasn't a major issue at all, and we would definitely recommend this place to anyone looking to visit Berlin.