If you are looking for BLT best to book as soon as you know your dates. BLT studios, especially the value's go quickly, generally at the 11 month window. As PP mentioned, the studios are all over the resorts.
If you are specifically looking at AK (Kidani) the best areas are closest to the lobby area. The busses drop you of near the lobby and it can be a long walk to some of the room at the end of the loop. That being said, if you have a car and plan on driving it isn't really an issue since you can park underneath your room/section.
When we stay at AKV we generally bring a car as parking at the parks is free. However, the busses are pretty reliable and I think 30 minutes would be the longest you would be on the bus and then only if there is traffic.