Vienna Lounge is indeed awesome but it's located in another wing of the terminal and before the passport control. If you had a longer layover, I'd recommend you to check it out, but under these circumstances it might be better to skip it.
Also note that unless you have a card that allows entry, quality of the Vienna Lounge is reflected in its price (i.e. it's more expensive than usual for third party lounges and more expensive than the other airport-operated lounge at VIE).