Directions to Piraeus are available here.
The conference will be held at the University of Piraeus premises (Karaoli and Dimitriou Str, 80, Piraeus). The conference has not made any specific arrangements with any hotel, since there is a plethora of various types of hotels in the area.
Most often people who visit the University use the following hotels which offer a good price to quality ratio. Please ask them if they can offer you a University of Piraeus rate.
Piraeus Theoxenia Hotel
Hotel Cavo D’Oro