Indoor Gardening and Houseplants: Maple leaf begonia monster, 4 by JoWalker

JoWalker wrote:
I started a plant from leaves given to me by a Russian lady. She worked in an office with no windows. I noticed how pretty the plant was under no day light conditions. She called it a maple leaf begonia and gave me some leaves. I stuck the stalks in water and after about 4 months roots grew and I potted it up.
It grew into a monster! I had it in a southeast facing room with filtered light. What can I do to grow a start that develops into a more tidy plant like she had?? Thanks!
PS does anyone know what kind of begonia this is?