Has anybody ever used this outfit (air41.de)? Does anyone have any reliable information about them?

I can't quite put my finger on it, but it all looks a little bit suspect to me. There have been several cases recently (both here in the UK and in Germany) of airlines that existed on paper and on a web site but that never came off the ground.

The postal address on the web site looks like a residential address. The domain name is registered to a private person (not the same address as the one on the web site). Are we really dealing with an airline here, or just with someone's ambitious plan?