Heathland Lodge is an epic mirror cabin in the golden cirlce area. They are located in an open field which makes them perfect to watch northern lights. There's very little light pollution around which is important for the northern lights. It's also so cool when the northern lights are reflecting in the mirrors at night.
The cabin itself is also incredible. There's a private hot tub, sauna and small kitchen. I highly recommend to stay here if you are visiting Iceland!