"Red Oven": A nice cliff facing south, can get very hot in the sun, to avoid in summer. Perfect in Spring/Autumn.
The routes are very well protected (bolts very close, almost like climbing indoors), the stone can be slippery.
There is a grass area and picnic tables at the base, and some (drinkable?) water in the playground nearby.

Remarks

There is a big hole at the bottom off the cliff (on the right side), maybe 3m deep, so careful when stepping on/off the cliff. The whole area is officially closed due to "geological instabilities", with a red/white tape, so crossing it is at your own risk :)

External resources

Keltenkalk 3
Bergsteigen.com