Most reviewers are very positive about this hotel, and our experience confirmed their sentiments. The hotel is tightly run; everything is in good order; the breakfast buffet includes the bacon and eggs that comfort the travelling British; and above all the sisters are exceedingly helpful. The hotel is not actually on the beach, but the beach is very close.
If you stay at the Nascar, be sure to take an excursion on the trenino verde. This under-advertised narrow-guage railway climbs into remote and magnificent parts of the Sardinian mountains. Travel as far as, say, Gairo and then hike among the forests and nouragues (http://www.sardegnaambiente.it/j/v/874?s=3&v=9&c=6713&ids=11) before returning by the evening train. A more celebrated hike is the descent from Golgo to Cala Goloritzè: the beach is indeed magnificent (though stony). However, you need stout shoes, a generously sized beach towel, and a good 2 litres of water for the 2-hour return ascent; and you must be pretty fit.