In reply to chrisa87:
Santa Maria Navaresse as mentioned above would make a nice base with plenty in that grade range or Cala Gonone although some of the single pitch in that area are getting more polished.
If you stay in Santa Maria Navaresse there is an amazing multi pitch route on the pedra Longa pinnacle just up the coast at 6a+ which I really recommend and was the highlight of my first trip to Sardinia.
I've also stayed in Nebida on the West Coast and that has plenty to recommend it too, the village itself doesn't have beaches and isn't very touristy but you have got superb views of a dramatic coastline, beaches nearby, plenty of climbing in the grades you mention and the option of some granite trad climbing for variety at Capo Pecora.