Where do Willow and Guy enjoy hanging out in the novel, Willow?

The Stacks are on the eleventh floor of the university library and are where all the rare books are held. The first time Willow and Guy meet, she takes him up into the stacks to find a book he is looking for. The two spend many more hours together in the stacks because it provides near privacy while Willow is working. The stacks are where the couple has many emotional conversations and where they share their first kiss.