I made a new cover for it by using an old, white bedspread in a grossly fabric as material. The only thing needed besides that was a sewing machine and a handfull of needles. Nothing special, very easy and it took me about an hour to complete it, awesome!
The fabric was a perfect square in the beginning and needed to be longer in one way to cover all of the sofa. I solved the problem in the easiest way and simply just chopped it of at one side and sewed the pieces back together again (but this time so the fabric got the rectangular shape I wanted).
Like said before, very easy and the seam is almost not even noticable.
I'm pleased with the result!
Peace!!