Thanks for the replies.

If I stay in Quarto D'altino how can I reach TSF airport, that too my flight starts at 8am and I am planning to be in airport by 6:30 am.

After a long day in Venice, I am thinking of staying near to the airport so I dont have to be in hurry in the morning, any suggestions for this.

As other OP suggested if I stayed in Mestre, how the bus transportation works, where should I book the room to take that bus service to airport.

Thanks again.