I am a Greek living abroad and have been to Santorini several times in the past. I wanted to schedule a tour to show my in-laws the whole island but was reluctant to rent a car or use tour/public buses due to how crowded it is in the summer.
Kathrin, Marco, and the team at Santorini Experts were phenomenal. First off - they are all fluent English speakers which made communication easy. Before arriving in Santorini I was in continuous contact with Kathrin via phone and email, fine-tuning the details of what we wanted to see and coordinating the tour. She even made suggestions for local restaurants and helped me make reservations! She was always accessible and offered what was essentially a concierge experience for us.
Marco picked us up near our hotel and drove us around Santorini in a comfortable air conditioned minivan. He knew all the best photo spots and was able to customize the tour on the fly in order to accommodate us (we don't walk very quickly and needed a bit of extra time to get around). He was knowledgeable, patient, and took some great photos of the four of us! We had great conversations about the island, its culture, and its people. It felt more like we were being shown around by a close friend or family member, rather than by just a tour guide.
What really sets Santorini Experts apart is how warm and hospitable they were. They truly embody the idea of philoxenia. When we visited Santorini, I was initially reluctant to hire a private tour. In retrospect, I am so happy that I did. All four of us had an incredible experience that we will always remember.