I've seen several posts here of potential guests asking for discounted rates for various reasons. It finally happened to me over the weekend!
"Hello! I am a student at xx University and I commute from xx where I currently reside. I will be taking a winter session condensed course running Monday through Friday, 12/17 - 1/18 and was wondering if you would be open to renting the room Sunday - Thursday nights for a slightly reduced rate the weeks of (Phone number hidden by Airbnb) and 1/13 - 1/17. Let me know if this is something you would consider and a price per week you think would be fair. Thank you! xx."
Thanks to all of you, I sent her a message saying that the discounted rates are for full weekly and monthly rentals only, as the price listed is already fair. Funny thing is, this person has only been a member since November 2018 (I'm pretty sure they signed up JUST to ask me to lower my rate), so there are no reviews. They also don't have a profile picture.