just don't have US/Israel passport or visa stamp from there, and Iran will be one of best experiences in your life. people are amazing, culture is just WOW, whole place feels ancient even to europeans (and it is...). it is properly exotic in some parts in a way that will soon be only a thing of the past for most 'exotic' places on the earth, that look more and more like a standard copy&paste westernized locations.

most people speak OK english, very welcoming and friendly. don't trust some crap propaganda.