Property prices in Croatia are already on a main stream European level so unless you plan to spend a lot of time there any investment returns are likely to be modest at best. Poor winter climate compared to Spain and Portugal and relatively short summers.
Although the natural beauty of the country is attractive that’s where it ends in my view. Spend some time there and you will realise my meaning. 🙁 The coastal regions are also very popular with Germans who have pushed up values.
If you take the long view however with property investment and by that I mean up to 20 years then the return may well be justified but you could say that about almost anywhere. Even Spain 😯