My stay here was absolutely wonderful and I'll be sure to come back during my next stip to Berlin! The hostess was so kind and helpful, and always provided delicious food and guidance. She's also super knowledgeable about a ton of things, including historical notes, so that you can learn lots about the city just talking with her.
The room where you stay is split between a sort of bunk/loft-bed (yet you still have some privacy), so that if you were to share the room, it may get loud. I was therefore woken up around 4:30 am the day my "roommate" left as she had to pack and leave for the airport by 5:30. However, if there is no other person sharing the room (or you're simply not noise-sensitive like I am), it's wonderful!
Note: the bed may be a little small for tall people.