Flying for them, a year now, and living in Tehran, I can assure you, that Iranians are very polite, helpful, and have a grate culture .
Not a muslim my self, I respect their religion, as well as their culture and habits that have to do with their religion.
Very safe Country to live, nothing to fear of.
Don't be confused by the media's negative propaganda.
I would'n be here and fly, if it was unsafe, even if they payed me millions.....