Originally Posted by
worldwidetraveler
Never been to Berlin before but looks like I'll try the TXL bus. If I use priceline to find a hotel, it seems like they divide selection zones between west & east of the downtown center. So if one travels to Alexanderplatz can he use the metro or bus service from there to travel to all the major "downtown" areas?
Yes, you can continue on busses, U-bahn, S-bahn etc . And on the same ticket at no extra cost. The bus lines that run to and from Tegel are part of public traffic system.
See:
http://www.bvg.de/index.php/en/Bvg/Start