Leo Z.: Terminal G is the best I've so far anywhere else: no security control while changing flights, free wifi, great leather coaches for a short nap, working desks with power outlets.
Kali Motxo: Don't use CAT to go downtown, it's a total scam! Instead, follow the S-bahn signs (pic). S7 trains arrive In Wien-Mitte in 20 minutes for just 3.80€ & you can also use it with VOR passes, vs 11€ CAT.