I think cats make the best pets. I do not want to be labeled as one of those "creepy cat people" and I will not tell you that my 23 cats are super-intelligent and able to communicate with me better than most people. This is not true. I don't even have 23 cats, I have one. His name is Fred. He is quite peculiar.
Why are cats the best pets? They do not require constant care: one does not have to go home at lunch to let them out, one can leave them for the weekend as long as there is enough food in their bowl. They are clean. They do not smell (although if you try to have over 5 cats living in your studio apartment, there will indeed be an odor). They are generally not needy. They do not steal your cigarettes.