So I emailed my landlord before I left work on Tuesday. At the advice of Internet Commenter, I asked for 50% off of my August rent with the expectation that they would haggle it down and that I would get more like 25% off. AND THEY DIDN'T. THEY JUST ACCEPTED.
In less pleasant rental news, there's currently a cockroach trapped under a water glass in my bathroom. Fortunately that happened before I read the email from my landlord, so my morning got better rather than worse.