The phrase "warm place" refers to a location or environment that is comfortably heated or has a pleasant temperature. It can be used to describe a cozy and inviting area, often free from coldness or discomfort. Full definition
Let rise in warm place for about 2 hours or until doubled in size. (holajalapeno.com)
Cover with kitchen towel or plastic wrap and allow to rise in warm place for about 1 hour, or alternatively, allow to rise in fridge for 8 - 12 hours. (foodfitnessfreshair.com)
Cover with towel; let rise in warm place until doubled in size, about 1 hour. (dineanddish.net)