I live in Amsterdam, Netherlands. I'm Italian. I want to visit Istanbul for 1 week in March. Do I need a visa?
If were a citizen of the Kingdom of the Netherlands, with a passport issued by that country, you would need a visa.
If you are a citizen of Italy, with a passport issued by the Kingdom of the Netherlands, again, you would need a visa.
If you are an Italian citizen, with a passport issued by the government of Italy, then you are exempt, as you yourself indicate.
Assuming you're Dutch, you need to get a visa. You do this online:
Italian citizens do not need a visa to visit Turkey.
For future visa questions for Italian citizens, although it isn't always accurate, check this