Like our beloved and famous forum member replied in her post, I would have thought that all the terms, conditions and salary details should have already been discussed and agreed between you two parties before taking the job....but anyway if you're accomodation is already taken care for, this should cut a huge chunk of money to save. At the moment it's difficult to put an approximate salary value on your job if we don't know your job title. When it comes to expenses, you might be living somewhere else and still have to pay for transport but I don't know. Perhaps if you left a few more details, people might be able to help you.
Hope this makes sense,