Last year I requested for a short term visa to embassy of Germany in Tehran. It took 3 month until they scheduled an appointment for me to simply hand over my documents.
There were 6 employees and therefore 6 lines before each window. I was socked by the crazy atmosphere going on in there. For a moment I noticed, every single one of those employees were screaming to their clienteles. Some of the clienteles were socked by their rude behaviour and were trying to provide the documents ASAP and some disputing back. I found such an inhumanly behaviour so strange specially from the employees of the embassy of a
country which has good relations with Iran.
On the other hand I’ve been in Iran’s embassy in Berlin many times and . think I’m safe to say they are really polite and helpful.