I stayed at the Stillwell last year with friends. We ended up on the 10th floor with a window and the air conditioner/heater worked fine. The elevator was small and a bit stuffy, but it worked the whole time. There are stairs too. The hallway is kind of stuffy though. But the room did seem clean enough; the restroom is a bit small and just be careful with the shower curtains(one of my friends pulled it too quick and it fell), but it was alright (we just stuck it lower on the wall where it could hold). The closet was good enough, and the bed comfortable enough. And we didn't spot any bugs. So my friends and I are going back for AX'13.
Short summary: It's toreable and is walking distance to the convention. Plus there are many restaurants and stores available to fit anykind of budget.