The green apartment 'Potami' on the ground floor was a real disappointment. The sanitation was awful (it was all mouldy). There wasn't enough ventilation and the cushions felt clammy. It smelt damp and musty. We nagged the owner and after three days she moved us to an apartment which was on the floor above. These apartments are much clean and they are more spacious. They also don't smell of damp. The mattresses in both apartments were a bit on the thin side, you can really feel the springs sticking through. This was our 7th trip to Greece and this was the worst accommodation (especially considering the price!).
The location was good ... we took some lovely walks. I can recommend bringing a guide which highlights the best places.
I can recommend hiring a car so you can explore as the busses aren't that reliable.