there is a night vapp boat service linea N that runs all night over a close approximation of the "1" line. does not make all stops. you can get to p. roma. from there take a land cab, which is not extremely expensive. tel # to check price and availability 041 52 37 774
the first bus is at 5am. should make it with plenty of time. 041 520 55 30
that 610 is close to the first flight out of vce. I doubt the airport counters will be open before 530. most are manned(peopled?) by airport employees, not airline employees.
when in venice get a copy of ospite di venezia. has the info in it.
I think the first Alilaguna from san marco is at 435. 041 520 55 30
ask at your hotel how early one must arrive.
there are hotels in the area, look on venere.com.
there are one or two new hotels in or near the new airport.
we always take the taxi, which we arrange days in advance at the water taxi booth in s. marco.