The wood panels might need a coat or two of new varnish. Or if the surfaces are damaged, you might want to consider painting them. While the interior does not look very appealing now, I'm pretty sure you can make it look much better if you put in the hours. Now is the time to do it because the corona epidemic is keeping the tourists away for the time being.
I've visited the island of Krk but where you are is much further to the south.
I was thinking either varnish or sadolin + some specialist paint. Will see, need to look into it more.
Yeah Krk is about 200km from where i am. I never actually visited. Might do it this summer.