I'm deciding whether to book a flight from Bergen arriving Oslo Rygge Airport or Oslo Gardermon airports. Norwegian air offers much cheaper airfare for arriving Rygge than arriving Gardermon airport. Would it more difficult and more expensive to ride the bus from Rygge airport to Oslo city center and does its bus stop near central train station (I will be staying at Thon Astoria). Its website does not show bus schedule in english, so i do not know its timetable.
On the next day early morning, I have to fly from Oslo Gardermon leaving at 7 AM. What's the best way available from Thon Hotel Astoria to the airport during this very early morning (train/bus/taxi)? As it is an international flight, I've to arrive 2 hrs before departure time. Therefore, what time should I leave hotel and by what kind of transportation?