We do. It is a little smelly and I am going to go pick up a DIY air purifier this weekend. We live in a 1 bedroom so there is no where else to put the rats. They are usually out on my porch if the weather is warm enough, but lately they have been inside 24/7 because it has been so cold.
I also have 6 bins running 1.4 with babies so they are a little crowded. I clean 2x a week to try and keep the smell down. I don't believe the smell sticks to items like cigarette smoke does, but I could be wrong.