I have been using airbnb for the past three years and hands down Chris's place is the best one. The apartment is breathtaking its beautifully decorated everything is very well kept. Both Chris and his girlfriend are great to talk to, they made me feel like at home. Chris was a bit busy with his project but he still made sure that he guides me about the city and answer all my questions. The location is perfect everything is close by night life, monuments, cafe's, bars and all the touristy stuff. All in all a great place to stay in Berlin. I'm surely coming back!
p.s the cats are pretty chilled out!