As so many other reviews led us to expect, Katarina and her family were excellent hosts. Katarina was away for the time we were there, but communciated incredibly well, with clear directions and great tips for enjoying the area. Her grandfather warmly greeted us, and showed us to the house. Overall, we felt more like welcomed house guests than airbnb customers.
They recommended a local restaurant for dinner, which was helpful as we came just before the start of the tourist season, and not much was open for dinner. Unrelated to the apartment, the food there was excellent, and was also a welcome experience as the only customers in the restaurant that evening, conversing with the proprietor's friends who were there to drink and pass the time.
Another thing to know, outside of anything to do with the apartment per se, is that Plati, and the whole Lassithi Plateau is beyond stunning. That includes the views from outside of the apartment, which overlooks farmers' fields and into the surrounding peaks, and is a wonderful rustic world away from the bustle of the Cretan coast.
The one thing to be aware of with the apartment is that the photos make it look more spacious than it is. It was comfortable and enjoyable, but it's good to know what to expect.