In order to get straight to the ruins, you would have to cross a private area guarded by the dog. Too bad. The internet read: "freely accessible". Of course it can also be that I did not find the entrance.
Walk the street towards Falkenbach. You can already see the remains of the wall directly above the mill. Striking is a supported section of wall with a round arch frieze close to the street. A few meters further you can see the "neck ditch". In there and then look for a good way.