Overall it was a very good airbnb experience.
Christian is very polite and helpful, so are his wonderful roommates. The room itself is great and the apartment is nicely furnished and very conveniently situated almost opposite the subway station.
There are only two minor "negative" things that I would note - 1. one can hear pretty well what's going on in the adjacent room and vice verca. This wasn't a big issue for me personally, but might be an issue for other travelers for various reasons. 2. the floor is rather cold at some places the apartment so don't forget your slippers if you are travelling in autumn or winter.
Apart from these two things, my stay was very good.