Helga's place is conveniently located within walking distance from Alexander Platz. There is an S-Bahn and U-Bahn stations just across the road. It is especially convenient to get there from Schoenefeld airport by direct S-Bahn line.
The instructions for check-in were very easy to follow. Helga was also flexible about earlier check in, as my flight arrived early in the morning.
The apartment has everything needed and is sparkling clean.
Great experience!