Through your own private door, then upstairs to a sunlit hideaway high among majestic oaks. Your apartment is the third floor of Carson House, an 1870s Victorian home. It's sumptuously appointed for your stay of three nights or a month. With a queen, a futon and an airbed, it's comfortable for 1 to 4. It's your "tree house" in Cathedral Hill, the mansion-filled historic district of St Paul--an easy walk to grocery, hospital, history center, restaurants, shops, buses, and colleges, and more.