The 3-day freedom bus tickets cost 25 euro. The ticket entitles you to return journeys on the express bus to and from the Airport and city cente, the hop- on hop-off city tour bus (green line) as many times as you wish and can also be used on the local bus service (i.e. number 77 or 77A). The ticket is valid for 72 hours from the time it is first validated.
My question: has anyone purchased this? And was it a good value?
added info
I decided to do this after reading this link
http://194.106.151.179/specialoffers.aspx