We just got back and had two different rooms while we there. One was in the 90's on the first floor and that was more noisy. We were facing the parking lot, but you would hear luggage rolling, people or kids running.
The second room was in the 80's on the third floor. It was quiter. Not sure why, must have been because there was only one floor above us.
From the two rooms we where in, I can say you still here the people right around you. Its not as bad as I thought, I was always able to sleep. But it is weird to hear someone peeing in their bathroom and then flushing. Can't say i have ever heard that in a hotel room before. We chuckled. We love Pop and that really isn't that big of a deal. You are so tired from the parks, that you fall asleep. If there were screaming children all night that could keep you up Im sure but that never happened with us.
As for the beds, I hear they are new. But I think they are really bad. If there is something you can bring to put on top of the mattress so that when you lie down you don't feel all the springs, I would bring it. It will help you sleep better. Yes I do have a really bad back, but my husband didn't and he woke up with pain and being stiff, which he never does.
I hope you have a wonderful trip.