Now that food has joined the discussion, it occurs to me that food costs could offset accommodation costs.
If you get a 1BDR, you'd have a full kitchen. Even though the CS breakfasts are generally reasonably priced, you could feed the whole family eggs and toast in the room for less than the price of 1 adult CS breakfast.
And that's just breakfast...
...add in some lunches and dinners, make sandwiches that you take with you for the day, and that's a pile of savings.
With 5 people eating, you could easily save more money on food by having a kitchen than you spent to upgrade from the BCV studio (83 pts) to the OKW 1BDR (131 pts). Yes, this works out to more than $400 overall, but it's only $72 a day (or less than the cost of a character lunch).
So, with the 1BDR, you'd have much nicer accommodations and less exciting food (although this could be good if your boys are picky eaters). With the studio, you'd spend less on your accommodations, be a bit more crowded, but have more money to spend on food.
So, what will your family appreciate most?