I am taking a night train from Venice so I need a place to keep my luggage until then. Is there a luggage center at Venice station? If so, now much does it cost and when is it open?
Assuming you are departing from Venezia Santa Lucia, there is a left-luggage office near track 1.
Opening hours are from 6 am till 11 pm and cost is
6,00 € the first 5 hours
0,90 € /hour from 6th to 12th hour
0,40 € /hour from 13th hour on
If possible however, you should try to ask your hotel if they can store your luggage for you until the evening, which will likely cost you nothing or a much smaller fee.