The modern (inverter) paraffin heaters are great.  Very efficient.  However, they need a power supply to operate as the have an integral fan and are electronically controlled.  The other down side is that they are expensive to run, especially in Spain where the fuel is twice the price as in France (both Leroy Merlin for comparison).  A typical 5 litre refill will last about 12 hours and a 20 litre bottle of PTX 2000 will cost you around 40 euros here.  If you travel via France regularly it's well worth buying some on the way down.
It's difficult to give specifics without knowing the size and layout of your property.  If you could describe the size of the rooms you need to heat it would be easier to advise on log stoves etc.  The butane heaters are a good all round solution.  They don't need power, are relatively cheap to buy and run, are portable (as are the paraffin) and last a good few years before they need replacing.  The main down side is lugging the heavy gas bottles around.