Hi I wanted to know if anyone knew about the rights of an apartment renter.?

I want to know if they could just come into your apartment based solely on an allegation . What happened is I stay around a bunch of old people and at first they would call the cops saying that I was to loud one time they called the police when I wasn't even home saying that i was having a wild party well I filed harrment charges and they stopped but now my apartment pepole put a note on my door saying that it was reported that my apartment was in their words "VERY UNSANITARY" and now they want to do an inspection on my home like I live in some project I pay $800 a month I am mad because I have a young son and with those types of allegations I could have cps on me. I have lived in this apartment for 3 years never have I been accused of having a dirty home even now my home is clean but i feel like the apt people believe whatever they hear they won't even return my phone calls so I wanted to know if anyone knew what my rights are or should I retain counsel and sue for slandor.