I made a last minute reservation. Juliette was very reactive and helpful. When I arrived, as it was raining she had already ordered diner for everybody (including me). And she reserved a taxi for me as I should leave early the next day.
Her house is perfectly located, near Tegel airport, very quiet and nice neighborhood, near a forest and a lake that I didn't have the time to go. There is a big supermarket nearby (less than 10 minutes walking).
I highly recommend her housefor a perfect stay in Berlin.