In Spain, can I land and take off from my own property?
It depends on your local and national regulations.  In some jurisdictions, local municipalities can regulate use of land in that way, and in others they can't.  So first check with Spanish national regulations (if separate from EASA) on what constitutes an aerodrome or airport to see if there are any restrictions on use of an unlicensed piece of land as an aerodrome (probably not), then check with local municipal regulations or zoning or use bylaws that may restrict use of your land as an aerodrome (a definite possibility).