Claudio's apartment is in a perfect location, close to the U-Bahn and great restaurants/bars. It's also much bigger than we expected and beautifully appointed! Every detail was perfect and the apartment was incredibly clean. He's a great host - he was super responsive via text and let us keep our bags there until our flight a couple hours after checkout. We really appreciated it!
However, my partner & I are sensitive sleepers and had some difficulty sleeping in the bed. I believe this is because the bed can fold up into a twin bed/couch from a queen mattress, which seems to be very common in Berlin studios (from what we've seen on AirBnb)!