I booked a taxi and a driver just on the ferry to the island. I sent a quote through the website. In like 10 min, I missed a phone call which was their landline number. The lady(general customer service I guess) on the phone was not helping and not friendly at all. But I got a text message as well from a mobile number. This guy(sales manager?) was nice and friendly. He connected me to the driver, Nick.
Nick knows everything about the island from the history to the current locals!! He took us to several lookout points, one winery(Poderi Crisci, nice place different wine style from famous Mudbrick) and Mudbrick by my request.
He planed the 2 hours very efficiently and managed the time well. Very friendly, has a good sense of humour, and inspiring person himself too.
Taxi tour is not a cheap option but when I'm tired and don't have enough time to wait for the buses, it worth for me. I really enjoyed the trip with Nick, as he gave me a bit of advice on what would be the best transport option in the island I guess I will book him again next time with some more friends! (for a smaller pie of the cost)