Standicing in Lussemburgo

The astronomy club of Luxembourg has good people to help with this. Try calling them. https://aal.lu

But one thing they suggested was places to go with lower light pollution. That would limit your location anyways. Mostly northeast or north west of Luxembourg. There is a map online that shows the light pollution. I would suggest you going in person to the place you would like to go to, beforehand. So you don’t go to some random or inaccessible location at night and then decide to figure things out. Have some food and snacks. The single most important thing if you have a telescope, make sure it is properly focused and magnification is working. If it’s not, then trying to adjust the telescope at night with zero light is just horrible (personal experience).