Parwana's place was exactly what I needed. It's three separately booked bedrooms with a shared kitchen and bathroom. I stayed in Room 2 which is the smallest room. Some of the reviewers mentioned not liking that it shares a wall with the bathroom, but I didn't find this to be a problem at all. Noise issues are going to be dependent on fellow guests. While I was there, it was no problem.
Check in was easy and not a problem. Just look at the pictures and read the instructions.
The room contains a comfortable bed and a not very comfortable desk, so not a lot of furniture if you want to spend tons of time in the room, but perfectly suited to a visit to Berlin where you'll be out and about a good bit.
Great location! This is my favorite neighborhood in Berlin and this place is well positioned to take advantage of the neighborhood. Also, I highly recommend the walk-up pizza window around the corner with 2.50 mini pizzas.
Overall, the room is a great value.