My experiences of casual working in Europe may be some many years ago but I guess the principles are the same.
The very naive Mr & Mrs Tonyt were wandering around Europe in the seventies, Ford Escort van - absolutely no frills - winter approaching so needed some work and accommodation.
Very simple really, you just knock on hotel doors until someone says you can work here. Board and lodging with a very basic wage - perfect to pass away the winter.
You just have to be prepared to do whatever work is available and sometimes it's pretty degrading.
We were "lucky", ski resort in Austria with every afternoon free to enjoy the slopes but the day started at 5.30am and finished when the last saucepan was shiny and clean and back on its shelf - often after 1am.
Glad we did it but never again.