Bratislava is about 70 km distant from an International Airport in Vienna, Austria. The transport from Vienna airport to Bratislava is very convenient. A train, bus or taxi can be used.
The best option is taking a bus. Slovak Lines or Flixbus operate shuttle buses every hour between the Vienna airport and the Central Bus Station Nivy in Bratislava (Autobusová stanica Nivy). When you arrive at the Central Bus Station Nivy, please take the public transport bus 42 and drop off at “Hodžovo námestie”. From there, you can see the conference hotel which is just a 1-minute walk away.