If you are looking for other quilters in your area, check out other board members in Germany. You can search by location:
Click on member list near the top of this screen.
Click on "search members" (under the ...w-x-y-z), and select "Advanced Search"
Type in the location you are interested in and a list of board members will come up. You may have to spend a few minutes to see who is currently active, but if anyone is in your area, you can send them a PM and see if they would be interested in starting a round robin or other type of swap.