Are you asking how to describe Nafplio in your listing?
It doesn't look correct, it gives the impression that you're saying it's the capital of Greece at the moment. Here's how the Wikipedia page describes it in English, in case it helps you:
It is the capital of the regional unit of Argolis and an important tourist destination.
The city was the second capital of the First Hellenic Republic and of the Kingdom of Greece, from 1827 until 1834.