We went to Santorini in September. The apartment kept cool all day long, despite of the heat outside, so we didn't need any A/C, which was perfect. The shower had very warm water and we had a good sleep during the nights. The location is perfect when you have a rental car / quad. It's in the middle of the island so you can easily travel to other towns and villages with all on a max 20 minute drive. There's a swimming pool which is perfect for when you have children or want to cool off a bit yourself.