Best bits - comfy bed, good breakfast, 15 mins walk (not 5 mins!) from Alexanderplatz, friendly and helpful staff, good shower, good wifi. Stayed 5 nights but would not have room facing main road if we stayed again.
Worse bits - our room (21) faced onto a busy road with traffic all day and night and with no air con either so too hot and stuffy or too noisy - take your choice! Bathroom very compact but clean. TV - all German language channels only. Our first floor room had issues with cigarette smoke from guests smoking outside the front door.