I was really looking forward to Little Sister, but found it to be overrated and represent the worst parts of tapas-style dining.
The portions were way too small, and the quality of the food wasn't so great that it made the prices worth it. The worst thing we ordered were the mustard greens, which included only two pieces and cost $6 or $7. The seating and service was also far too casual for the price point.
You'd be much better going off to Restoran Malaysia in Richmond Hill. Malaysia and Indonesia have similar cuisine (nasi goreng, satay) and the dining experience was much better there.