I have one that looks like your that is labeled Den. Emma Queen -
Its all white on the back of the flower too. The petals usually aren't as curled back as they are in this picture but I took late in the flower cycle.
You must be doing something right with new growths coming in. Hard cane dens will lose their leaves as the canes age, eventually going completely bare.
The hole in your leaf may be caused by slugs or snails or, more likely, from water sitting on the leaf too long. Mine grow outside year round and they get holes in them from time to time. Best not to allow water to stand of the leaves over night.
Mine get about 3 hours of morning direct light and I'm watering once a week as well.