Poseidon Hotel in Athens, Greece. The newly renovated Hotel Poseidon is located in one of the finest suburbs of Athens, on the seafront, next to the modern marinas of Alimos and Flisvos and close to stores, banks and entertainment centres. All rooms have satellite tv, en suite bathroom, mini bar and internet access. A wide range of business services are available to ensure your conference or meeting is run smoothly. Hotel Poseidon is ideal for those seeking to combine their business trip or holiday with comfort and luxury in a friendly environment offering high standards of accommodation.