My mum and I stayed 4 nights at Helen's place and enjoyed very much. The room is on the top floor of the house, with it's own bathroom and a small kitchen. Very clean. Many thanks to Helen for preparing us milk, beer, water and fruits when we arrived on Sunday eve. The house is located about 5 min walking distance from the tram station and 10 min walking from the airport bus station (bus no. 164). The tram runs every 10 min and it takes only 2 stops to the nearest S train station Kopenick, from where you may take line S line to Ostkreuz. The journey from Helen's door to Ostkreuz takes approximately 25~30min, still quiet convenience.
There are couple of restaurants 5min walk from Helen's place, we tried the local German one, very happy about it.
The room is one the top floor of the house, for elder people with walking problem might need to consider how to get upstairs.