The public transportation system in Budapest is safe, cheap, and extended. The student package contains necessary maps and descriptions. Tickets are valid for all public transport vehicles: subway, buses, trams, electric street cars (“trolley bus”). Transportation maps on the Internet are available from http://hps.elte.hu/BSCS.
  For accessing any city destination from the Airport, the best value for money is the “Airport Minibus”, which operates as a multi-customer taxi, and costs 2500 Forints (15 USD).