I had quite a few as pets over the years. My first female, Bracken, would ride in my sweatshirt hood and happily stay there a while. I would go for 1+ hour long bike rides, even took her to my parent/teacher conference and hardly anyone knew I had her. While they do have their downsides (chewing and pee marking mostly), they do make really nice pets. I just wish they lived longer.I was really surprised to find the one I caught actually went into the livetrap. Rats are really smart. So smart that they avoid poison if it just makes them sick.
I knew someone that kept pet rats. Rats freak me out, like Grace Jones in the Conan movie, freaked out. (probably from watching Willard and Ben too many times) But they make very good pets and can be taught many tricks. The person I knew said they are much smarter than people realize.