If you need to organise your travels across Europe safely, you will be interested in the new Commission's platform ‘Re-open EU’.
The platform gives you up-to-date information on the travel regulations. You can thus have an overview by country, of border control measures, travel restrictions, available means of (public) transport, public health and safety measures (physical distancing, wearing of a face masks) as well as practical information about restaurants and other services.
This site is available in 23 EU languages and is very easy and fun to use!