The observation tower is well hidden in the forest. It is quite high and made of stone. There are several levels and different types of stairs up to the observation platform (first made of stone, then wood and finally metal). At the top there is enough space and you can see very well in all directions. In front of the tower there are some garden benches if you need a break.
I don't find the route strenuous (except for the last 500 meters). I couldn't find any opening times, but the gate was not locked and I was able to get in.