Hi Melissa - You can reach out to the housing office at liveon@psu.edu to ask about the mattress size. The HUB deck will not be available for general parking during arrival. It is reserved for move-in and staff parking. You will be able to park in long term parking in the Jordan East lot. We will be providing a shuttle to return to housing areas. You could also park downtown which is closer, but traffic is typically heavy during that week. Cyndy