The blogger at Poemas del río Wang is a personal friend of mine. (Sometimes I also write for his blog.) By profession he is a translator and art historian, a Hungarian by birth living in Berlin. I have gone on many of his tours, and travelled with him personally as well. I can unreservedly recommend his tours, but they fill up quickly. Most of the participants are Hungarian speakers, but he can translate on the fly into English, and other languages, too.

A link to his upcoming Iran trip: http://riowang.blogspot.cz/2015/08/come-with-us-to-iran.html

Incidentally, I wanted to go on this trip, but as a US passport holder, I would not be free to go wherever I want without an Iranian-appointed guide on a limited itinerary (at least as I understand the situation).