Symbian,
Did your wife not go with you on your previous trips to Dubai? If not (or even if so!) the best thing to do is have her accompany you for the interview. You are shown the accomodation, schools etc and get the chance to ask as many questions as you like. Obviously the recruitment team puts a positive spin on things but they know that if your wife hates it in Dubai you are not likely to stay and that is the last thing they want. When I went for my interview we stayed on afterwards at one of the beach hotels for a couple of days, partly for a holiday but partly to have a better look around.
I'm pleased to say my wife is 100% behind the move but I'm not sure I'd like to try it otherwise.