We stayed at Klaus' place because it's very close to Mercedes-Benz Arena, where we would attend a concert. It's located at a quiet neighbourhood in the east side of Berlin. Nevertheless, it was very easy to get to the major sights in Berlin (Download the FahrInfo app to navigate around). Klaus' apartment is everything as he has advertised. It's clean & comfortable. Klaus himself was very communicative and detailed, who ensured our check-in process was as seamless as possible.