By plane: Vienna Airport is located approxiamtely 20 km from the congress venue, and you can easily get to the venue by taxi (20 minutes), train (30 minutes) or bus (40 minutes).
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The best method of getting around Vienna is via public transportation. A combination system of busses, trams, trains and newer subway lines makes getting around Vienna easy and efficient. This system is relatively inexpensive and is used regularly by both tourists and locals.
Vienna has a well-developed public transport network. Buses, trains, trams and underground lines will take you almost anywhere in the city in no time at all. Vienna public transport Wiener Linien operates five underground lines, 29 tram and 127 bus lines, of which 24 are night lines. Vienna works on an honesty system with no ticket barriers at stations and no formal, permanent ticket checks on the subway, local trains, trams and buses. You just hop on and off unchallenged. This doesn't mean public transport is free, though. You do need to buy a ticket!
See more about the public transportation here: https://www.wien.gv.at/english/transportation-urbanplanning/public-transport/