Yeah but no pension, a pathetic holiday pay, no expenses (and this is an expensive job to be in) and no security. All with zero respect. If working in the uk you may find your tax code will take time to adjust - 5000€ a month net is not a realistic expectation from flexicrew. A good month about £3500 and a bad month as low as £600 once all tax codes are sorted. But if you're happy then good for you and enjoy!
What I will add is that it IS an opportunity to get a permanent job.