Crescent Victoria Island, Lagos. The official telephone number of the Consulate is 01-4485698 if you are calling from within Nigeria, or +234-1-4485698 for calls from outside the country. If you wish to send an email, you should direct it to email@example.com or firstname.lastname@example.org .
But for Visa issues, you should forward your emails to email@example.com.
As for the Italian Embassy in Nigeria, it is located at 21st Crescent, off Constitution Avenue, Central Business District, Abuja with telephone numbers +234-946-02974 For emails, the official email address of the embassy is firstname.lastname@example.org.