Best pet to keep in an apartment?

I currently live in a one-bedroom apartment and i have 1 dog 1 cat and 2 bunnies and 1 ferret. hope this helps oh and to the person above.... you are wrong, bunnies do have to have a companion or they will get to stressed out and die. they have to have a friend, do your research before you make the wrong decision, look it up, i don't mean to be rude but i was just informing you. and ferrets are great pets.