Wimdu are a funny company. They are basically a copy of Airbnb and trying to do everything that Airbnb does - only they are not half as good. When I signed up, some years ago, it took them ages to verify me. They even gave me a phone call and asked lots of stupid questions - took about half an hour.
I have a Wimdu guest staying with me, right now, though, and he is a nice guy. So the bottom line is - Wimdu works just about fine, eventually. You need to be a little patient during the sign-up process. Also, remember that it is the Easter holidays, right now, so life in Germany is slow, this week. Most people are still dreaming of Easter bunnies, only slowly getting back to work.