trains – How reliable is public transport in Cagliari, Sardegna, Italy? Do you have contactless trips?

I have to change the flights in Cagliari on Sunday night and I will have about 2 hours off between the two, so I decided not only to sit in the terminal but to run to the city. I have an interest in history and transportation (and maybe food, but this calendar definitely doesn't allow for a good meal).
I made the following plan:

18:55 arrival

19:11 / 19:44 Take the train from Elmas-Aeroporto to Cagliari station

Walk from the station / port to Republicca to take a tram only for a few stops, then return with another and walk back to the train station (or by bus).

20:40 / 20:44 / 21:00 Take the train back to the airport.

This are my questions:

  • How reliable are schedules and trains? Should I expect them to arrive on time?
  • What is the easiest ticket issuance option? Do they make contactless trips? (I have an account debit card in euros) I looked at Trenitalia and the ticket description says it is only valid at the given time, but I cannot know for sure which train I can take. Can I buy train tickets before traveling? Is there a return ticket? (However, the price is so cheap that I don't mind paying two singles, the main limitation is time.
  • What would you suggest visiting (walking through) in the old town of Cagliari? Based on the search for Tripadvisor and Google, I hope Bastione Saint Remy is the biggest success.
  • Are tram schedules reliable? It seems to be a 20 minute service on Sunday night. Do the same trams return from the final station? (they have a return time of 6 minutes there) What is the fastest ticket issuance option for trams? I only found Italian on the tram website, so it doesn't help much.
  • Can I rely on Google Maps (my usual transit application) for bus stops, arrival times and route? (returning to the train station)
  • Emergency question: what is the best way to take a taxi to the airport and how much would it cost me approximately?
  • Additional question: can you suggest a restaurant or a street food place to try the local cuisine very quickly? Probably takeaway or standing tables.

Thank you if you can answer any of the above.

Prediction of AS Roma vs Cagliari

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Prediction of Roma vs Cagliari – AS Roma This time will face Cagliari in the Italian League this week directly at the Stadio Olimpico (Rome) on April 27, 2019 at 23:00 at night. In the match this time AS Roma was promoted to win. While Cagliari will not be easy to surrender even though this game is difficult to play at the opponent's base.

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