Heating a house with electric resistance heating is very expensive in most parts of the country. It might be a good choice if you plan to install solar panels. If your home will be all electric than the best option would be an air or ground sourced heat pump.

Do you have natural gas at the property?

I am in central PA, built a house last year and decided to use electric for central heating (cold climate heat pump). Of course, long term, I don't if issues will arise, but I can certainly say for the couple months I have been living in the house (and electric bills ;)), I am extremely pleased with the HP's performance!

Depends upon location. No one in New England would choose basic electric heat over gas or oil due to cost to operate. Average residential solar here in winter will not make electric heat significantly more competitive price wise. However, the improving technology of cold climate (air) heat pumps is intriguing. The HP systems requiring deep wells here add great expense due to that drilling.

"my plan for now is radiators and underfloor heating in toilets all on electricity"

Wow, that would be prohibitively expensive here in the USA. Surely you have heat pumps available in Croatia?