A hugely important historical port in Greece, Piraeus is also one of the largest in the Mediterranean. A full-on city, Piraeus is a great place to go exploring, with traditional European town centers, parks, lovely churches and houses. The tree-lined streets and gorgeous harbor alone warrant strolling rights. The port is one of the chief ways to get to destinations in the Aegean Islands and earshot locations in the Mediterranean.
As a modern city, Athens has modern accommodations. To get to Piraeus, quite simply hope on the metro, which by line one gets you to pretty much right to the Saronic Gulf Ferries. One in, a number of buses will escort you around the perimeters of the harder to reach locations in the spanning area, in fact, it is recommended that you plan your trip around the area with plenty of spare time, as it can take the better part of an hour to go from one location to another. Private transfers can also be arranged for more flexibility.