It's a great place to stay. It is near the TV station and Alexanderplatz. You have a great connectivity of S-Bahn and U-Bahn ( both the stations are infront of the house) . You can also walk to the TV station based on the weather. It has a mall with good brands as well
and The house has everything required to make your stay comfortable as well. Helga and her husband made sure to provide you with all the provisions. It is a modern house and they even have a coffee machine which is amazing. The house is very neat.
Oh please note If you're coming from Berlin Schoenfeld Airport S9 directly drops you in front of the house at Jannowitzbrücke station (it takes 40 mins though).
The only thing which I noticed and this could be for the days I stayed is that people don't keep their lights lights on nor I could find any switch. And it becomes a bit dark but it is safe as it has two layers of security. If given a chance I'd personally come here and stay once again. Thank you Helga and Alex for your hospitality and for making my stay comfortable.