Just a few observations from a herp enthusiast / rat breeder and a landlord.
1) Most snakes are harmless and don't damage a property. They would not bother me at all. I have allowed dogs and parrots. Most have worked out well. Some have burned me to the tune of many thousands of dollars.
2) Breeding a rat colony in your room is just plain nasty. Do you have a girlfriend?
3) I would evict you in a minute if I found you were breeding rodents inside a residence. I don't do it here and I OWN my home. You CANNOT get that smell out. Frankly I find it terrifically disrespectful.