Come to think of it, I seem to remember the sign saying Javan Leopard when I shot this very photo, but my memory is not reliable, as has been shown. I trust you when you say this is most likely Persian by looking at the fur, but they seem rather small. The small size and the shaggy fur might suggest Amur or Chinese instead. How about that theory? I will go with Amur in the meantime, until you or someone else prove me wrong!
The problem is, that all the cats rotate partly in this house, so the signs can be wrong sometimes.
I will talk to some friends from berlin, let's see if we can find out what spicies this is