Actually Lilspaz has 33 rats

But 13 rats comprise "The Horde". I will let her answer for herself on smells but I can tell you about myself personally. I have 15 rats in 3 different cages in my livingroom and if I don't keep their cages clean then yes they smell. But I clean cages 2 times a week. Mid week it is just a spot clean and then I really scrub everything on the weekend. My cages don't smell if I keep them clean. I have in fact has people come into my home and comment that they are amazed. They can't even tell I have rats in my home and if the cages were not there they would not know. It also matters what kind of cages you havel, what kind of bedding you use, how many rats are in a cage etc.
Staci