Plane tickets – use your favourite flight search engine. If you don't have a favourite, try kiwi.com.
Restaurants – if you come here in the off season, many restaurants will be closed, but locals will be able to tell you where to go and get the best food.
Prices at the destination – as expected nice accommodation isn’t exactly cheap. On the other hand, it’s not overpriced either, and there's a wide variety of choice.
Calls and data – for EU citizens, everything is the same as at home. WiFi is common in hotels and restaurants and is free.
When to come here – practically any time except winter months. In the summer months of July and August there are a lot of people here. So, it's best to go in spring or autumn. If the weather is nice, the end of February or the beginning of March is a very pleasant time – daily temperatures around 15°C, it is not for swimming, but nature is waking up. And most importantly: there are no tourists this time of year.
Website – a nice website with information about Sardinia can be found here.
TIP – if you have an extra day of vacation, you can extend your stay in Santo Lussurgio and plan some hiking for at least one morning.