Parwana & Frank's place is located near Schloss Charlottenburg. This is a quiet neighbourhood with free on street parking. Check in is super flexible since you receive a code to open the door. The rooms are small but clean, the shared bathrooms (2 bathroom to share with 4 rooms) are very nice and also very clean.
A lot of amenities in the living room and kitchen (even a mobile charger).
There is a budget supermarket (Penny) just around the corner and also a bio supermarket (of course a bit more expensive).
Since the weather was fine, I used a rental bicycle to go to Berlin City Center each and every time.
I quite enjoyed my stay!