The place is simply great. It is comfortable with all amenities. It is clean, stylish and cozy. The bed is directly on the floor but has its charm and its level of comfort. The bedroom is a bit small but you have a large living room you can hangout in. The hosts: Magda and hubby are great. They live there too but largely out of the way, or should I say invisible :)
I was there for work so haven't had the time to check touristy stuff but it's in the middle of Berlin and within walking distance of trains, trams, buses... as well as restaurants and places to chill.
So yeah all in all, this is great. I totally recommend.