If you love traveling and diving into the authentic atmosphere of specific country or place, there are a few sites that come handy.
Couch surfing
Rumor has it that this is the biggest website for couch exchange. People register for free at the website and share some information about their interests, things they like or dislike and what they can offer to the travelers. Members are not obliged to offer couch (accommodation), by selecting Maybe or Coffee you can tell the world that you can’t host someone at this moment but you are open to meet for a drink.
