Polite way to express displeasure to person who subleted to me?

Polite way to express displeasure to person who subleted to me?

Two and a half months ago, the boyfriend and I decided to move to Seattle, somewhat spontaneously. Since we didn't know the city well, we decided to get a sublet for the summer while we felt out the town, so in the fall we could move to whatever area we decided we liked best. We found a place on craigslist, and the woman offering it showed us a few pictures and said it was "Pretty small, about 500 sq. ft." The boyfriend and I were fine with that, as it was the size of our apartment at that time. So we agreed to rent her apartment site-unseen. I know that's a bad move if you can avoid it, but neither of us could afford to buy plane tickets and miss work just to check it out. We moved up, saying we'd sign everything upon arrival. Once we got to the apartment, well, it was not 500 sq. ft. It was tiny; later I measured it and confirmed it was only 300 sq. ft. I guess this is where there are two types of people. There are people who would say "This isn't the size you said it would be" not sign anything, and storm out. And there's us, people who only have one friend in town and don't want to assume they can stay with her until they find an apartment when they have no guarantee how long that will be, and who realize that they can't stay in a hostel, because all of their stuff will be coming the next day and they have no place to put it. So we signed for the apartment, and payed our rent. As we lived in the apartment, we came to realize that "furnished" to this person had not just meant "I'll leave you my furniture", but "I'm going to leave all my bric-a-brac and decorative plates on your shelves and tables" in addition to bags of meat in the fridge. We're vegetarians. This was particularly confusing to us because she's mentioned she had moved all her stuff to her mother's place in town, so it's not like she had nowhere to put all these things that she left. We also found balls of cat hair under all the furniture. We're not allergic, but she never mentioned having had cats, so what if we had been? Living here for the summer, we've started to feel cheated. I want to know if these are things that commonly happen in subletting that I just wasn't prepared for, or if anyone else has had experiences like this. If so, what did you do? We'll be handing the keys back to her next week. As she doesn't seem like she's trying to scam us, she just seems oblivious, is there a polite way to say "Hey, just so you know, you're apartment is roughly 60% of the size you said it would be, and you left so much stuff in it, that we couldn't even use all that space. Based on that, I'd like some of my money back?" Or even sans-money, would saying we didn't appreciate it be productive, so that if she sublets her place again she'll have better etiquette? Or should I just chalk this up to knowing better next time, and never rent site-unseen again, which I fear you'll tell me is the only thing to be done.
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