The COVID-19 Dynamic European Restriction Map
COVID-19 rules, restrictions and regulations are dynamic and changing much like drone rules. In Europe before you fly you should visit the local flight rule maps, to see where current restrictions are.
Information ranges from “You need third party insurance with coverage for up to two million in damages” or “In a town you are allowed up to this altitude, outside of a town, to that altitude, and in these regions you have a military flight corridor, thus a flying ban.