In reply to zmv:
Airport: ? Innsbruck is 2,5h away but surely there's a better possibility in Italy
2) there are 2 campgrounds in Arco within walking distance of the Colodri ( multipitch) and town centre. Easter though is very busy, so probably best make a reservation.
http://nuovo.arcoturistica.com/camping-arco-home.html
http://www.campingzoo.it/
3) Plenty of good routes to chose from, but as said, Arco is VERY busy during holiday times, so it's worth considering 'quieter' crags, which also tend to be a bit less polished. The new guidebooks (easily available in the many climbing shops in Arco) have good star systems to get you to the best routes suiting your taste.