Great value for money and superior location in you want to catch the morning train to Warsaw from the Gesundbrunnen station.
I was kinda moved by the classic Air bnb style of the place. There was an actual air mattress on the main bed.
It was also an interesting experience to see a 100 years old Berlin house and how it works in practice.
Not for you if you are into posh comfort rooms. Highly recommended if you just look for a good night's sleep.