I can recommend the place. The hosts were very friendly and responsive!
Charlottenburg is a nice neighborhood and the subway station is pretty close.
The place was small but clean. The cleanines may differ as you are sharing the bathrooms and kitchen with other guests.
The kitchen is small and but you can easily cook a meal for two in the kitchen.
Depending on the other guests there you might here them in your room. If you have a light sleep you might wake up by people getting there bicycle in the morning, since the bicycle storage for the house is pretty close to the room. Positive is that I couldn't hear any noises from cars.
All in all it was a pleasant stay.
BTW the TV in the room is really nice!