What is the authenticity of the Hadith: "Angels do not enter a house in which there is a bed for Satan," and what is its meaning if it is authentic? Is it only for warning against extravagance, and what is the ruling on one who owns another house with beds that are only used for one month a year? Does merely leaving a bed untidy prevent Satan from sleeping in it?

There is no hadith (definition) with the wording: "Angels do not enter a house in which there is a bed for Satan." The authentic hadith is: "One mattress for a man, one for his family, a third for a guest, and the fourth is for Satan." Its meaning is that any bedding beyond what is needed is for boasting and blameworthy extravagance, or it becomes a place where Satan sleeps and rests. There is no harm in owning a house in another country and furnishing it with what is needed when visiting it, and this is not considered extravagance or harboring Satan.