Neat freak roommate

[FredaHamm]

I live in a two bedroom apartment with two roommates, "Erica" and my 'big sis' "Katie." Erica and I share a room and Katie has a room to herself. Katie is a "neat freak." She cleans the apartment VERY thoroughly a few times a week. She constantly whines about the fact that Erica and I don't. I consider myself to be a neat, clean person. I always clean up after personal messes (cooking, etc.) but I (and Erica) don't see any need to vaccuum or clean the toilet when Katie has already done it several times in the past couple of weeks. If I leave a couple of pens or papers on the counter for an hour while I am in class, I will come back and Katie will have very neatly organized them. She will then get mad at me for leaving them out. Twice in the past week she has come home drunk and yelling at us about it. She stormed out with a friend after one of these episodes and then she got made at us for not checking on her. When Erica is alone, Katie talks behind my back and when I am alone, she tries to talk about Erica with me. I try to explain to Katie that not everyone has the same cleaning standards as she does, but she maintains that she "just doesn't understand" us. She already has the better end of the apartment deal (the private bedroom), even though we all pay the same rent. Also, Erica and I both have jobs while Katie does not work, so she has more free time than we do. Erica and I are both tired of being treated this way in our own apartment. We live on-campus so we aren't allowed to move until the end of the year. Any thoughts on how to deal with Katie???