A week-long group stay in the Poconos in winter requires more from a vacation rental than a quick weekend stay does. Between early December and the end of March, Pocono Mountain Rentals manages purpose-built homes near Lake Harmony built for groups of roughly 15 to 30 guests, with chef’s kitchens, dual refrigerators, in-house laundry, several separate gathering spaces and high-speed wifi at every property. Over seven nights, those are not...