Kirsten is a good host. Every time available.
It is a nice and cosy apartment, but looks like a "only rented for airbnb"- flat. I assume the neighbors love her for that. All in all it´s great to stay there to enjoy Berlin and his nightlife. Only 30 sec. walk to the Markthalle 9. Just keep in mind, that the sleeping room is directly over the main room of the bar (open until 3 -6 in the morning during the week).