Cool to think of going outside and grabbing an apple off a tree in your own yard! Some patience, some pruning and you'll be able to enjoy that idea. It has medium sized fruit with lots of snap and juice, on a strong and compact tree. These need some space to perform and airflow to keep it healthy.
Cold hardiness - Hardy in winter to temperatures of -34C. Sizing - Royal Gala will get to be 15' tall and wide if not pruned, in a few years you'll need to artfully prune these once a year. Location - Full sun to 25% shade, windy spots are just fine, tolerates drought but for best fruit building performance water deeply once a week in a dry summer.