The guesthouse of Gisela and Moritz is a really nice place :) The house is really cosy and comfortable :) Initially we planned to stay for 2 weeks, so we especially appreciated a big and well-equipped kitchen zone :) House is very lightful and easy to live in :)
The place is really good to stay in Adlershof: 15 mins by feet to reach Humboldt University campus, 25 mins to U-Bahn (Rudow) or S-Bahn station (Adlershof; both points are almost equally distanced from the house, but in different directions).
There are plenty supermarkets in 10 mins near the house (Lidl, Aldi, DM).
Hosts, Moritz and Gisela, are really nice and jentle, ready to help you with any problems and complains, checking if you need any help by themselves.
In general, I strongly recommend this place to everybody who travel to Berlin!