Marbella Beach Resort was sold without views ie we all paid the same and the view is pot luck. So what most owners do is request their location through Owner Services at the time of booking. Another way is to call the resort direct, they speak good English. Give them your reservation no and request what you want. I suggest you ask for close to the ocean, afternoon sun, sea view.
The only thing is that everyone requests the same and having stayed there many times all the units are fine. You probably won't get oceanfront but it's worth a try. I know they allocate the villas the day before arrival.
Good luck!