It is located here N 48 18.752 E 8 58.802 and can be reached from the Berghotel Zollersteighof (booking.com). There is a free parking N 48 18.199 E 8 58.892.
We spent the night at the hotel, so we visited the lookout in the evening and in the morning. The length of the trail is 1500 meters. The main goal was to shot the castle surrounded by fog at dawn. This time the fog did not rise to the level of the castle, but still we made great photos. So we strongly recommend this lookout.