You have got to be quick to see that one bloom. I think my sister has the same one on her terrasse, unless there are more that only blooms once a year. It's beautiful and smells nice.

She gave me a Peace Lilly in the spring and it's really growing - they can grow quite big. I bought one more which turned out to have three separate plants in the pot, so I repotted those. So far they are doing fine, but I keep them in the shade.

Here's a link of how to care for them:
http://www.wikihow.com/Care-for-Peace-Lilies