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You can do tons of research, but when it comes down to choosing the perfect size air conditioner for your apartment there isn't one cookie cutter answer. There's no magic formula. You can probably figure what's best based on the size of your room but other factors might make this assumption a bit of a gamble. It's a similar situation when you're buying a pool heater. Even down to the units (both are measured in BTUs—British Thermal Units).
Aside from volume and space, other factors make it hard to nail exact numbers. Things like what the weather will be like, average temperatures at night, and direct sunlight can all make an impact when choosing a pool heater. Your best bet is to talk to a contractor from your area—their educated guess would probably be a lot closer to what you really need.