I travelled to Berlin for business reasons and my stay at Sabine's place was great. I ended up actually staying longer than planned. The place was very cozy and clean and the communication with Sabine went smoothly all the time.
A minor problem was the internet connection. While guarantying I had to work and the internet connection was not always the best for having online meetings. Sabine tried to solve it, but the improvement was not great, unfortunately. Now I found out that internet problems are quite common in Berlin in general.
In conclusion, I fully recommend Sabine's place for your next travel to Berlin!