I enjoy both a slow burn and an instant attraction, it just depends on what else is going on in the book. If it is a slow burn with not much going on that can make for a slow book.
I can pair a good with just about anything. I enjoy reading in the bathtub because in a house with 3 boys and a husband, it is sometimes the quietest room in the house. I really like to read at the beach but since I don't live at the beach that is harder to do.