My brother completed his PGP from IIM Kozhikode a few years back.
According to him, first year PGP students are randomly allotted single/double/triple occupancy rooms. The allocation varies for boys and girls. Single occupancy rooms share a common washroom on the same floor. They do not have an AC facility, and common washrooms are not provided with geysers.
Double occupancy rooms are provided with attached washrooms. Those rooms have ACs, and their washrooms have geysers. But the AC and geyser facility is available only after paying a monthly rent alongside the other fees. In the second year, there is an option to select either a single or double occupancy room.
The hostel rooms are top class in comparison to other colleges. The balconies open to a scenic, resort like view. The hostel allocation process changes each year, based on the diversity ratio and batch strength.
The hostels of IIM Kozhikode offer both single and double occupancy. The first-year students are randomly assigned to both single and double occupancy based on their availability whereas the second-year students get to choose their own.
Boys-
1st year: Triple sharing with AC
2nd year: Single rooms without AC
Girls-
1st year: Double sharing with AC
2nd year: Double AC or single rooms
All this information is based on the availability of rooms and may change every year.