We loved the Guesthouse (Petra) for the Villa Thea. It is beautifully designed, with excellent finishes and everything you could need for a stay of a week, which we did. Although there is air conditioning in both bedroom and living room, which can be needed in some parts of Greece in the summer, the guesthouse is designed so that the breezes at the top of the hill on which it is located flow through the house and keep it cool without the air conditioning on. You only need it if there is no breeze. There is plenty of room for four, with two bedrooms and a large sitting room. The pool is clean and beautifully presented. Polina's father kindly met us at the port and took us to the guest house, which we may have had trouble finding otherwise. He was kind and charming. There was every electrical appliance you could need, and while the washing machine was not located in the guest house Polina's mother made sure we had access to it when we needed it. The Guest house is actually attached to the Villa, at a lower level, so if the Villa is also rented out you are in effect sharing the pool and environs with others. We had the place to ourselves for most of the week, which was blissful, and then six people rented the villa for the long weekend. The Villa and the Guesthouse are beautiful and we loved Kea as an island, as it wasn't full of tourists when we were there (late June 2013) and had lots of restaurants and beaches to explore. Definitely worth a return trip, and hiring out both parts of the same property (Villa Thea and Petra Guesthouse) with a group of friends would be awesome. Although we didn't get to meet Polina her father was charming and very helpful. Thoroughly recommended!