We had a very nice stay at Danai House. Maria and her associates could not have been nicer or more accommodating when our flight was canceled and I lost my luggage. However, my friends and I were a bit surprised by the quality of accommodations, which was not sufficiently noted in the description or other reviews. For instance, we were not expecting the mildew odor in the apartment or the 20 min lead time for hot water. The mattresses were not terribly comfortable (thin and hard). Perhaps all of this is standard for cave houses, but it would have been good to know that beforehand. The pictures also made it seem like there was a better view of the water from the patio than there was.
I was unsure whether to write this because our hosts really were nice, helpful people and the travel agent they work with (also named Maria) gave us some excellent recommendations for Santorini. However, these are some of the things I would have liked to know about the accommodations.