Well, you also have an extra risk, namely that they decide not to hire you after those 2 weeks. So it depends on how much they pay for that period. They should

Well, you also have an extra risk, namely that they decide not to hire you after those 2 weeks. So it depends on how much they pay for that period. They should be paying freelancer rates, to account for the overhead (taxes, health insurance, etc) and that extra risk.