Have you tried looking at travel volunteering? You can literally just look up people who want help and they give you somewhere to stay in exchange to help them out for a few hours a day.

I did a search in Croatia for you here.

It is how thousands of people get around the world travelling on a small budget every year :D We recently stated posting opportunities on our new subreddit r/HelpStay if you wish to keep an eye out for some that may pop up in that area or worldwide.

If you want any info on travel volunteering then please just ask and ill be delighted to help :)