I also ran into Lee Martindale who, I suspect, will be also composing her own letter to the concom and Hyatt corporate.
As someone of average proportions and able-bodied, many of the tiny bathrooms with switch-back corridors were difficult for me to navigate and I was horrified to even imagine the stress it was causing those who were less mobile than I.

Also the utter lack of WorldCon-generated signage was terrible. Especially in the West Tower where some other con-goer (not a Hyatt staffer, or Con staffer or volunteer) was kind enough to direct me tot he Silver Level of that space because the Hyatt signs ran out abruptly and there was no other source of directions and no one to ask. I spent a lot of time frustrated