Great place to stay with family!
Lots of places for children. Edeka and Rewe supermarkets is about 100 meters - nearby U-Bahn Rudow.
If you want to save money to get from/to airport - there is a BVG ticket machine, just buy ticket 'Kurzstrecke' (https://sbahn.berlin/tickets/alle-tickets/einzelfahrausweise-tageskarten/kurzstrecke/) to Waltersdorfer Chaussee-Neuhofer straße intersection. Fabian's place is about 100 meters from.
Taxi is about 13-15 euro.
Fabian's family is very helpful, friendly and careful.