We stayed in the queen suite, and truly believed that was the best suite in the hotel.
The view from our balcony was amazing, as you get a view of all the white buildings, the caldera and the Aegean Sea. The balcony is not ground level, but up just a few stairs outside of the room. Breakfast is delivered in a box each morning to your room. We enjoyed it each morning on the balcony which was amazing with the views.
The queen suite also has a private plunge pool (jacuzzi) on the balcony, enclosed in almost a 'cave-like' atmosphere, with lights for a night swim. Because of that, our jacuzzi was truly private, compared to other hotel suite jacuzzis. Most of them are on ground level and have tourists walking by, however because the queen suite's balcony is elevated and the jacuzzi is enclosed, it is actually private. The room was spacious, and always clean. The location of the hotel is also great as it is situation in Imerovigli (right between Fira and Oia). There is a bus stop just a few minutes walk outside of the hotel, or you can rent an ATV to get around the island, and park it for free at the hotel.
Overall, our stay was amazing and we would definitely return to Santorini and stay at Senses again!