Hi,
a pitty that u didn't receive any helpful answers, surely there are some birders around Freiburg.
I don't live there, but in the near of Nuremberg and we got both species here, tengmalms owl and pygmy owl.
Last week i was lucky to watch male and female pygmy owls mating, without great fear under unbeleivable conditions (10 Meters, sunlight, 7 o'clock p.m.), right from a footpath without any hide in a large forest area (Sebalder Reichswald).
Tengmalms owl is more difficult to watch, they start calling some hours after sunset.
Also European Nightjar and Woodcock are quite common birds of the evening here.
So if You will be in Germany next time with some time to spend.. feel free to send me a pm.
Good birding
Stefan