Judith's place is really awesome. I spent there around ten days for holidays and work, and it was perfect for both. The metro station U3 Krumme Lanke (still in zone B) is 10-15 minutes walk away, with a supermarket open 7-22 just in front. The same distance to join two lakes for lovely walks: I've come across a couple of foxes, an heron... S1 Mexikoplatz for Wannsee and then Potzdam is also at walking distance (half an hour); Freie Universität is 3 stops away; downtown Berlin 45-50 minutes.
The house is nice, with a very big and quiet garden. Judith has let me use the kitchen for cooking and has left some room in the fridge: I've had all my breakfasts and several meals in the house without any problem. And she has a dishwasher, too...
There is a large bathroom with a shower on the first floor and a small restroom on the ground floor to share with all the house. My room was on the second floor, accessible only by wooden stairs. The room was big and well lighted, with windows on three sides: there was a comfortable double bed, a small wardrobe and a big desk for working with a laptop, just in front of the garden and the trees. The Wi-Fi works fine and there are plenty of power sockets.
My arrival was scheduled late in the evening: I've written it to Judith and the communication has been smooth and quick, so when I've arrived around midnight her husband Paras managed to open me the door, without waking up their children. They have been nice and attentive hosts: they have left two bottles on the desk at my arrival (water and wine!), have given me lots of suggestions for sightseeing and have even lent me an iron and an iron board.
Beware of a couple of things: it's not possible to lock the door of the private room and there are no curtains in the bathroom. That's not a big deal: Judith's family is really respectful of each own's privacy and all the houses in the neighborhood seem to have no curtains.
I've sincerely fallen in love with Berlin - Zehlendorf and I won't hesitate to rent the same room again. Thank you Judith and Paras!