We didn't know anything about Thassos when we booked the ticket (in the last hour) but ended up having a fantastic week with our two kids (age 2 and 5). And Elenis hospitality and the great apartment at Pantheon was a big part of it.
We hired a car for the entire week and drove around the island, swimming at multiple beaches. But we enjoyed "our own" beach, Trypiti, the most. It was perfect for us and the kids.
The hotel is only a 250 meters walk down a dirt road to Trypiti beach. The hotel itself is so pretty! We had the biggest apartment: two bedrooms with an enormous balcony overlooking two directions: the giant mountain and a glimpse of the sea.
The rooms were very clean and tidy, spacious and had all we needed. The bathroom was very small but worked fine.
As I said, Eleni takes very good care of her guests (she even tought our kids how to climb the mountain and gave us a quick sightseeing to the next village). Both we and the kids loved her and would love to come back!
If we come back to Thassos we would definitely stay here again.
Our advice is to hire a car in advance for your entire stay, that will pick you up from the airport for no extra charge. And then drive to Pantheon Studio Apartments yourself, it's much cheaper and easier than booking a bus transfer or taxi.
At night you must experience both villages Limenaria (a few minutes drive) and Potos, close by. It's perfect for dinner, to stroll around, enjoying the sunset etc. Wonderful!