Hetzner is simply not a platform-as-a-service. It might be a good deal for a server, but that's not what you're paying for with a PaaS like AppFog. What you're paying for is application lifecycle management, from deployment to scaling to cloning to re-deployment on a different infrastructure, to adding services (like Mongo, MySQL, etc.) at the click of a button.
Serverraum alleine = etwas ganz ganz ganz anderes.
Agreed. As I write if you have will to learn Linux server management, you can easily achive what it offers. I can use PaaS if the price as low as not worth to do server administration. With same price point, I can have a real hardware with 12x more RAM and 1.5 TB disk cap and I can also add a skill to myself which is a good thing for long-term. Nowadays adding a service to your infrastructure is just an apt-get command. Deployment is easy as a git push. I totally understand who don't want to deal with terminals, config files etc. But as I said for me it is far from useful.
Serverraum alleine = etwas ganz ganz ganz anderes.