Room is charming-looking and has a "soul". I genuinely liked the self-made design stuff. But it's not enough.
Firstly, it's about location. Neukölln is really dirty and dangerous ghetto with a lot of strange people on the streets. But probably you know where are you going)
Secondly, it's noise. It's 1st floor and entrance is just behind the wall of the room, and window is on the street side. Some noise from neighbors from the 2nd floor is hearable too. So it's barely possible to sleep sometimes.
Kitchen and bathroom are... meh, usable.
And finally, I saw mice several times in my room and in the kitchen. It's an old house and I get it (I'm not afraid of them, but be careful if you are). But it's still not that pleasant guest in the room you are staying in.
Was it worth of its money? I don't know. Probably because of its size and decoration , yes, but... you decide