Dietrich is a lovely and friendly host, who provided lots of helpful information.
The accommodation was exactly as it was described and check-in and -out were very easy.
There is a tram station (M10) right in front of the house and another (M5, M6, M8) just five minutes away.
Can highly recommend it, especially if you plan on spending a lot of time in the eastern part of Berlin or attending a concert at Mercedes-Benz Arena.