I remembered something else that I have been heard. I've been told that, you are supposed to fix the branches as horizontally as possible, so that rose blossoms along the branch, and not only on top of the branches. I am not so shore is it thru, and how is it supposed to look like. My rose should clime the fence on the wall. How to fix it?

Hello Kalista, if you're going to continue growing this on your balcony in a pot then the first thing that you should do is to make sure that it is growing in the largest pot that you can handle and fit on your balcony. Roses need a fair amount of room for their roots, and though the pot should allow for good drainage, larger pots are less likely to dry out. The climbing form of Iceberg is a fairly vigorous plant and you will do well to contain it on a balcony. You will need some sort of a trellis, or some arrangement of wires, fixed to the wall to tie it to. Though it is possible to grow a rose successfully in open ground and not bother feeding it, a rose grown in a pot will need feeding. I don't know about German books on roses, perhaps someone else can help you with that, the book in English that would be most helpful to you would be Roses by Peter Beales, he has sections on growing roses in pots, and suggestions for growing climbing roses in pots.