I have over fifty rats in my bedroom, it might sound scary, but I never smell them. Nor does anyone who enters my house. I keep them clean, well ventilated, hydrated and cool. I get zero smell from the rats unless I let them go over a week without being cleaned. Any other time and it is simply a wood smell from their bedding.
The best way to do it is make sure their cage has plenty of ventilation, the room has a fresh air supply (fan or air conditioner), and maybe put a drop or two of vanilla extract in their water. I don't use vanilla extract, but I've heard it helps by making the rats drink more water, thus cutting the smell of ammonia from the urine. Other than that, use Aspen or Kiln Dried Pine as bedding and house them in something with lots of room. The more room they have in their tub, the less they will smell. Most smell issues come from overcrowding anyway.
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