We had a great time at Anna's pension.
Andreas offered us to organize our pick-up from the ferry to the house, which was super helpful. The place is a bit outside the big touristic areas, but still well located. We walked several times to the city center of Thera (ca 25min) from which all busses start. There is a closer bus stop, in case you don't want to walk that much. The bus system works well and each trip is 1,60€.
For 5€ extra we could have a breakfast buffet at the hotel, which was a nice addition.
I can really recommend this place to other travellers.