I stayed in Gerit's apartment for 4 days. The room is very comfortable, big bed, large window, a lil table and a wardrobe - you have everything you need, also if you're staying more than a couple of days.
Gerit is super nice, she's a great host!! We had tea as soon as I arrived and then she was very helpful for everything I needed and she gave me very good advices. She makes you feel at your leisure, like you're at home :)
The house is in a very good location, you can reach almost every point of interest by walk.
I absolutely recommend it. If I ever come back to Berlin I would definitely ask Gerit :)