It sounds like you chose Garden View which I think is a great choice!! I would definitely request a particular longhouse, floor and even side of longhouse!!
Most longhouses have three floors and most of the second floors do not have balconies, so you may want to decide if you would like a third floor balcony or a first floor patio. You should also think about what you would like to be closest to - the pool? the lobby/monorail/shops? the path to TTC? that will help determine which longhouse you would like to request. Some longhouses also face different areas on different sides - so you may want to ask for a particular side as well. For instance, when we stayed Garden View in 2005 we requested Fiji, third floor, marina side and got it!! We loved it because we had a full balcony, we were very close to the Great Ceremonial House and we had a view of the Marina and a bit of Space Mountain (even though the room was Garden View!) So, it's definitely worth doing a little research to see which longhouse looks best to you!
Have a great time!