How legal is it to purchase in btc in spain? Would the government honor such a transaction? Also do you have to be a citizen to own property there?
I also doubt in legality of such deal. State will be able to declare such transaction illigal and buyer will lose his coins and the house. It even may be trap for brand new bitcoin millionares appeared in large numbers recently
Maybe by having a face to face meeting first, and making sure the home documents are appropriate. Payment issues with BTC can be done in any country.