It isn't a true galley; although wooden throughout it has a keel and angine, and can only take one bank of oars on the deck. It also has a bar. However it did, very much, look the part! It has been used in several historical dramas. It has a shallow draft and was very easy to beach and un-beach, in much the same way as the ancient greeks must have.
On the return trip they turned off the engine and raised the sail, which carried the boat along at a good pace!
The captain, Dimitri, was a jolly soul, very much from the school of Zorba, and made it a great trip; I'd heartily recommend the experience. The boat sails from the resort of Nidri, and the tour is very good value at e40.