Unfortunately, it's illegal to buy property in the EU with BTC. To those who are not familiar with this business, it's also illegal to pay in a foreign currency like the US dollar, or to pay cash save in one country. Even if the buyer accepts BTC, the transaction must be in the currency which is legal tender in the country, and the price shall be written in the contract. Sorry, but there's no choice.
Good to know how it's done in EU. But this cannot be taken as standards for othe countries. In my country bitcoin is not a legal tender but people still trade it. But I also thin there might be problems in reconciling the price to fiat for documentation. This is actually a problem easy to solve, just convert your btc to fiat and buy your property.