If there is any way you can wait the one week until you get home to Italy, it would best for you to purchase your iPhone in your home country. You refer to international warranty. There is no international warranty for iOS based devices and Apple's specific warranty says that "warranty may be limited to the country of purchase." Dubai is a tricky place to purchase an iPhone in. Many sellers do sell authentic iPhones, but many of those sellers procure devices from all around the world. So you could wind up with a phone intended to be sold in a different country, which may make any support you need for your new phone limited to impossible, especially, if a replacement phone may be required.
I would find a way to hold out until you get home to Italy, to avoid what could be a major hassle in the future.