Karl has been one of the greatest host I've ever dealt with.
Perfect communication with him at any time of day. All essentials were there (in some case even more than really needed!).
Super nice, clean and cozy flat. Really close to many public transportation lines. Internet has always worked flawlessly as well as the powerful and free to use bluetooth HIFI speaker :)
I'd recommend the host to anyone who wants a true and unique Berlin experience.
Auf Wiedersehen