Christian was quick to respond, and though I didn't meet him in person (his friend arranged the key drop off since Christian was on vacation), everything was arranged well and lots of clear communication made it easy to sort out the details. The place is well located, close to the U1 (one block) and S-bhan (across the bridge). There are plenty of grocery shops and restaurants nearby, and lots of nightlife (locals refer to the area as the Techno district). Be warned that there are five floors you must walk up to reach the apartment, but everything you need is there. If you are sensitive about water, I did found the tap water to be a bit silty, but it's totally safe and clean to drink. Everything in the apartment is hooked up to remotes, the lights and sound system, so it's helpful to be tech savvy or get good instructions on how to operate everything before arriving. But the sound system is amazing and I loved waking up to good tunes. The space is big and bright, and full of modern touches. I had a great stay for almost two weeks, and was glad I got to see this part of Berlin. Thanks Christian!