Hi Giorgino and congratulations with your new job. As far as I recall from the time I started in the company, the non-Luton based people will be put in the Ibis hotel (next to the airport/10 min from the academy) for the duration of the course, EXCLUDING the few days off we had during the course. easyJet assumes you will be going home on these days and therefore does not provide accomodation. You will not be able to claim any expenses back, if you decide to stay in the hotel at own expense on a day off.
Most of them who did that, however, were able to strike a good deal with the management at the Ibis (eg. stay at company rate etc.).
This might all have changed, so if in any doubt, call recruitment and ask. They'll be able to give you the correct answers.