A co-signer does not guarantee good behavior, or zero damage, or zero noise, or zero people parking on the lawn or smoking in the house, or bringing in pets or having loud parties, on and on.  

Know your noise ordinances and you could bring them up.  

She was staring daggers at me, making noises at me, yelling, that sort of stuff. 

I just got a request that a ceiling fan was "making too much noise".

This isn't something we have to deal with in most other areas of the country (though it's gaining in popularity).It sounds to me that two things are going on - first, it sounds like you agreed to take on the responsibility of getting the house inspected and up to code, and second, you've got a nosy neighbor that's fanning the flames with the inspection process.I would forget about the neighbor - it's just noise.  

If college students are going to cram 5 full-sized adults in a 3 bedroom/2 bathroom home you'll get a lot of wear and tear, parking is a pain, noise complaints in a family neighborhood, the occasional kegger, etc.

You can require ALL tenants to exercise responsible animal ownership, protect the property, minimize chance of harm to other people, and maintain acceptable noise levels that do not interfere with neighbors' enjoyment of their own property.A well-written animal clause will require the tenant to:Provide proof of current shots, if applicableProvide proof of flea control medication, if applicableDisclose the name and contact information of the veterinarian caring for the animal, if applicable (hamsters, for example, probably do not have veterinarians)Keep dogs in a crate or on a leash at all times when outside the dwellingUse a pooper-scooper, whether on the leased premises or another's propertyVary locations of dog urination, so as not to burn shrubs or lawnEmpty cat litter boxes daily into outside receptaclesControl  excessive barking that disturbs the neighborsAllow monthly inspections for pet damageImmediately clean any pet discharges and immediately report any damageAssist with Twice monthly HVAC filter changes for long-haired animalsKeep pet food supplies in pest-proof containersI think that if you approach the problem in this manner, you will be more comfortable complying with Fair Housing laws.

With students I always told them that I'll kick them out for noise, so go party somewhere else and let them clean the mess up in the morning, instead of you.What you could do is just start them on month to month, too.The good news about tenants who ask if they can paint, is that they intend to stick around and make it home.  

I too don't like the fan noise. 

noise!