One of the most expensive aspects of travel is lodging. Hotel stays can really start to add up after a week or two. There are many alternative lodging options available to help frugal travelers cut costs. Of course, one of the cheapest of these is staying with an acquaintance, friend or family member (because it is usually free). It’s true that host/guest expectations can vary widely depending on relationships, work schedules, and numerous other variables. Here are some general tips to assure that your stay goes smoothly and improve your chances of being invited to come stay again.