When it is working, Berlin has a fantastic public transport system. Here are some short suggestions on how to get about.
Most important too, even for Berliners: online search tool where you can search for public transport direction. Type in either a station or and the address.
Berlin and its surrounding area has three fare zones. A all the inner city within the S-Bahn ring, B everything from the ring to the city limits and C from the city limits to about the end of the suburb trains.
For normal sight-seeing you will only need AB tickets. Tegel airport is within zone B; Schönefeld airport in C, so for traveling to the congress hotel you’ll need an ABC ticket.
Tickets are available in single ride (or 2h) and day tickets. When you have more than two single rides a day ticket is the cheaper option. There are also several multi-day ticket that can be an option for intensive sight-seeing. You can by them at the stations or from the bus driver.
More at the transport association.
Before using the ticket, they have to be time-stamped, machines for that can be found on the platforms, in buses and trams or at the entrances to platforms. With a valid ticket you can use all trains and buses.
How to get to the hotel
The congress hotel is close to two well-known buildings/sights, so asking for them will get you back there. Those are the shopping center ‘Europa-Center’ and the Kaiser Wilhelm Memorial Church, a bombed out church that has been left as it was as a war memorial.
There are several bus stops around, but even the S-Bahn station ‘Zoologischer Garten’ is in walking distance.
The image to the left shows the connection of the public transport. Bus are indicated by purple and orange numbers and lines, the underground trains are blue and the S-Bahn in green.
There is an online search tool that can help you find directions as well.