I cannot recommend Theo's apartment enough! The apartment is perfect for a solo traveler or couple - it's equipped with everything you need to enjoy yourself in Oia and the rest of Santorini, which is truly a slice of paradise. First - the apartment: exactly as described and as appears in the photos, extremely clean (probably the cleanest airbnb I've ever stayed in) and equipped with all the essentials including an iron, water boiler, towels, etc The balcony view is just...wow. Truly enjoyed mornings and evenings relaxing there with a glass of wine that Theo welcomed me with! Second - communication - Theo was always available - either in person nearby or via mobile. He was extremely helpful in arranging transportation and activities, and he gave such great recommendations and tips for restaurants and cafes in Oia. Next - the location - Oia is amazing, definitely the place to stay. I managed to see most of the island by taking the local buses (not my first recommendation) and renting an ATV. The sunset from Oia is famous, but really you can see it from most of the island. What makes Oia great is that it has enough of the hustle and bustle but the apartment is located, as in the description, below that hustle bustle - you really feel away from it all and can relax in near-silence listening to the waves.
This apartment and location is really special - I highly recommend it to anyone who wants to enjoy their time in Santorini! As mentioned in other reviews, the only thing to consider is that there are many steps involved in getting to and from the apartment, so anyone who might have trouble with that would not want to stay here - i.e. someone who requires any assistance with mobility or who cannot handle multiple flights of stairs. I'd also recommend shoes with good grips as the rocks can be slightly slippery (my Birkenstocks had me slipping here and there).