Really nice apartment, the living room you stay in is a seperate room from the rest of the apartment, so you can have privacy if you want.
The location is great, pretty quiet area but still a walking distance from the center of Friedrichshein. The U-bahn and Tram stations are also really close so you can easily get to other places in Berlin.
We unfortunately didn't get to talk to Alex a lot, but him and his girlfriend were very welcoming and ready to help.
Would really recommend it and if we are ever back in Berlin, we would definitely consider staying there again.