We traveled in August, which is the month which all Italians go on vacation, so it was very authentic to say the least. Besides Italians, you find a few people from Germany and Netherlands. La Caletta is a small town who doesn't have much tourist information around, so if you travel, be sure to know Italian or bring a friend who speaks it. (My girlfriend knew some, luckily). Otherwise, communication will be difficult, as nearly no Italian speaks english.
The apartment was big and clean. With a great fridge, gas stove for cooking, air conditioning and wash machine. It also has a small balcony where we used to eat our breakfasts and dinners. Outside there is a big and beautiful shared pool. Almost as crystal clear as the waters by the beach 3 minutes away. The apartment also has a small TV with loads of channels, all in Italian. But I presume you wouldn't want to stay inside when you got sun, water and adventures right outside?
We rented a car from Olbia Airport, which is advised. There's not so many buses travelign the roads of Sardinia, I believe. At least not the east coast. They might be more tourist friendly on the north and west coast.
But if you want an authentic vacation without all the other tourists from your country, this is a good a place as any.