in my experience if you are a genuine customer and not a serial complainer, legitimate good properties actually want positive feedback about where they have failed or let you down in a timely fashion. those kind of places usually want to fix and remedy those kind of failures even if they are minor, and usually seem like they genuinely appreciate the feedback, so I would say just a brief heads up to them now would be in order. I mean promising something and then not delivering is a failure that they probably want to fix, because the kind of property that would even promise something like that to begin with is the kind of property that most likely looks to go above and beyond and when they didn't meet their own promise, I'm sure they view that as something they would like to improve upon.