Everyone uses different terminology, Vidanta Resorts call it a Master Room, many internet sites say Studio, most accurate is probably "hotel room"  except for the Luxxe Villas and Loft which are legitimate studios.  

Mayan Palace studios have two double beds and a small table and chairs. No kitchen.

Grand Mayan studios have one king bed and a love seat that pulls out into two short single beds only for kids. there is a balcony, but there is no cooling pool on the balcony. It's rated for 2 adults and 2 children under 13 years old.

Grand Luxxe Standard Studios likewise have one king bed and a love seat that pulls out into two short single beds only for kids. there is a balcony, but there is no cooling pool on the balcony. It's rated for 2 adults and 2 children under 13 years old.

Grand Luxxe Villa Studios are more like a small one bedroom suite.  It has a king bed and separate room with a sleeper sofa, refrigerator,  microwave and some even have two balconies. 

Loft Studios  feature a living and dining space complete with TV, an elevated bedroom with either a king-size bed or two double beds just behind the plush living space, one and a half bathrooms with one Jacuzzi tub, a private terrace with plunge pool, and a small private balcony at the rear of the unit.