Nice stay in Berlin (incredible wheather>20degC end of October!). Mendelssohn U-Bahn at 100m, and even S-Bahn a bit further, are very practical to go anywhere.
Compared to other possibilities (hotels or other Airbnb's), and although Berlin seems very expensive to me, the small kitchen and fridge could save us breakfasts and some diners at restaurants. (Lidl at 10min)
Martin's place is clean and confortable for 4persons.
-> I recommend!