I don't get a word of what he says but I do like his stuff. I discovered German rapper Trettman a few months ago on Youtube and I do not why, but today I've came back to his music.
I quickly shared it with some German friends which told me that, like his sounds, his lyrics are also good. Well, far enough for me coming if it comes from a pretty elegant Deutsche discovery. Great discovery.
He's, obviously, on Spotify, but I also recommend a proper look into his Soundcloud (where the rough diamonds are).