There's no difference between a deluxe studio and a standard studio at OKW. OKW has two booking categories for studios - near Hospitality House, and standard (outside the designated buildings for the "near Hospitality House" category). All the studios are exactly the same - the only difference in booking categories is location. If you want to be very close to Hospitality House then book one in that category, if you don't care where you're located then the standard category is fine.