The EU made an agreement back in June that all SIM cards must work across the EU with no roaming fees. All providers are now coming up to these standards. Most came onboard right away
Just pick up a SIM when you land (probably at the airport) and you should be good to go. Make sure you test it before leaving the store in case that country puts certain steps in place.
Also get maps.me, but google maps is still better for public transport.
__________________
|