Mine is on a bright windowsill, and I water it when the compost seems on the dryish side. Each flower doesn't last that long, but more appear all the time, so don't worry about that. The temps in the room where mine is vary from 15 to 20 degrees.

I hope this helps. By the way, they are easy to grow from corms - I planted some last October and grew some plants, putting about 10 corms per 1 litre pot.