Very close to gate C12, you can take aerotrain to separate building but not KLIA2.
They offer free drinking water, hot water and coffee.
Locker is medium size. I slept on clean bed for 3 hours at noon and better than have a nap on chair.
I would recommend if you need privacy for laying down. Is it for sleeping not for computer business passengers, All costs with outside eating is much better than plaza premium lounge which is no beds.