At home I prefer to study while lying on my belly on the (made!) bed. This way it’s easier for me to concentrate than when sitting at a desk. Not the best position for writing, of course, but that’s a different story.
At university I tend to sit o the floor in a hallway (with a nice, solid wall against my back) at the moment, but I plan to spend a big part of next semester on the low window sill (on top of a heater, and decorated with some potted plants, yay) in the library again.
In addition I like the wooden deck in the Japanese Garden, it’s nice for reading books on a spring day while listening to the koi splashing in the water under the deck.