The apartment has a great view of the Caldera. On-premises parking is nice, because parking on the island can be very difficult. The apartment is very clean, A/C works great. A simple "continental style" breakfast is included, which was very nice. You can order the night before, and they will bring it to you in the morning at the time you specify.
The apartment is run more "hotel style," with a cleaning service every day and mini-bar (water, soda, alcohol) for purchase. The apartment we stayed at (#1) had a private balcony. There is also a shared deck with lounge chairs.
Location is good, close to famous beaches. Oia is about 45 minutes away by car. Host was very friendly and helpful, especially if you're looking to rent a car or book any excursions.