Like all Stelises, this likes it wet and shady. Argentata is one of my favorites; the flowers are actually big enough to see, and I love the shade of red. As of now, four spikes are blooming, with another five on the way.
The general growing conditions for Stelises are similar to Masdevallias, except that they are more temperature tolerant at the upper end. The less fuss I have to put into keeping an orchid at just the right temperature, the better, so I’ve always had success with Stelises, while my luck with massies has been mixed. When open windows will do, I refuse to run the air conditioner just for a few plants.