We can't speak highly enough about this (literally) Wonderful House in Emporio and its wonderful owner, Nikolas. And don't let the location scare you off.
First, the house. In a way, the pictures don't do it justice. It's a gorgeous, spacious, coolly-decorated residence with 2 outdoor spaces, one of which on the roof offers an incredible view of the water and surrounding town. The lovely bedrooms and kitchen were as advertised. Everything worked, was clean and well-stocked. The entrance, filled with flowers and plants, made you feel like you were on the set of Mamma Mia.
When we arrived Nikolas greeted us with several snacks as well as a bottle of wine. He sat down with us and offered detailed suggestions on what to do in Santorini, his preferences and what to avoid. He helped secure us a kyack reservation and dealt with a car-rental issue. When we had questions (many) he was always available on either his mobile or landline phone.
The location of the house, on neither coast, might give some people pause, as it did us initially. But we found it a quiet repose after returning from busy touristy areas like Fira or Oia. It's set amid the old section of Emporio -- not old as in decrepit -- but full of charming, narrow walkways to the house. You park your car (and yes, one is needed) a few minutes away, not an inconvenience at all.
The beaches on the east coast are the best on the island, and just minutes away. Fira is about 15 minutes and Oia may be a half-hour depending on traffic. (Driving isn't as difficult as some guidebooks would have you believe.)
All in all a great experience. And Nikolas didn't even mind that we broke a glass pitcher!