Inflation has allways been high in Spain. Before Spain joined the € the interest rates on average were around 15%. This will give you some idea as to what the rate must have been. As a tourist we did not feel the real impact during our few days spent there besides the peseta that we bought reflected this via the exchange rate.
In the case of Croatia, Montenegro, Bulgaria, Slovenia its the other factors that matters. If the buyer has a member of his family from those part of the world & can act as a first line of defence in dealing with the pleasent or unpleasent issues that arise on an adhock basis than one could consider.