I suggest Hidden Valley, PA for a seasonal rental. I live here fulltime and I'm a ski instructor. We have a new resort owner that is doing fantastic upgrades including improved snowmaking,etc.
Go to
http://www.hvfoundation.com and click on "homes for lease". I suggest small places (1 or 2 bedroom) in the Highlands or Summit areas. I suggest upstairs units with lofts. Both areas would put you right within short walks of tops of ski slopes. I quickly looked and suggest you consider properties in the Highlands Area including 1123 Veech Lane, 1213 Veech Lane, 1210 Forbes Lane, 1107 Forbes Lane. Listings also are available for the Summit Area (I suggest 2nd preference).