There really aren't any bad locations for a standard view studio. Do you want an upper floor? To be close to the elevators?
If you want the best chance of seeing the higher level fireworks from IllumiNations from your balcony, ask for an upper floor across from the bus stop. (Those rooms aren't close to the elevators, so if you are travleing with strollers, wheel chairs or anyone who has trouble using the stairs, these rooms are probably not your best choice.
Best wishes-