The basic salary won't be too much , about 3k~3.5k.
Their allowance is very good, 210yuan per day, no need any invoice ,directly into your accont.
The hotel won't be bad, usually 350~500yuan, or 4~5star hotel. But they have contracted hotel.
As MGB is very very huge buyer , their supplier will very polite to you or anyone from MGB, so don't worry any travel, because you are the king to them