Thank you very much for your feedback, it covered all my questions.
I'm thinking to decline the offer, because although staying and travelling in lots of countries is a nice experience, which i like, on the other hand you are not really estabilished anywhere, just hotels and commuting.
And the salary is too low, like you said, especially in winter.
If, as you said, they put me on standby I can barely cover the food with that money.
If anyone else has other experiences to add, it's very appreciated.
Thanks