Margit's house was a very nice experience.
Location: From the airport you can easily get there, S7 and U-bahn. From subway, you'll do like 10 minutes. Also, from apartment until StephenPlatz you'll do like 30 minutes by feet.
Apartment: It is very big, like really big. The kitchen is equiped with all the necessities. Beds are good, very warm but you can fix the heat by termos.
Close to the apartment you can find 2 supermarkets, some good locals for food.
Overall was a very good experience and I totally recommend Margit! She was very open and nice, responded very quickly to my messages.
Good experience!