Delete storage / CFNetworkDownload

Hi, I'm trying to cleanse my computers memory.

The system (grey) is taking way too much space. I downloaded DaisyDisk, a computer app that shows what the system part consist of, and what you can delete.

(I'm sorry that these are in Finnish and Swedish)

The "private" part is really big. And I don't understand anything about it. Can somebody tell me if I dare to remove those last CFNetworkDownload files?