I know this is an old thread, but in case you're still looking . . .

We stayed two nights at Mystique in September. My wife and I loved it. There was no sunset view from the hotel, but my impression (at least for September) was that no Oia hotel that was low on the cliff overlooking the caldera would have a sunset view, because the sun sets over the other side of the island. One evening, we walked to the village to see the sunset. Yes, it was beautiful, but I didn't really need to see it more than once. I thought the sunset in Bali was prettier. The view of the caldera that you do get from Mystique, however, is absolutely amazing. I can close my eyes and see the image as if I were still there . . . .