Home Away from Home
Airbnb, available on iOS and Android devices
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You've probably heard the Airbnb spiel about 5,000 times by now, but with good reason. The rental platform has over 3 million home listings for you to choose from worldwide (oh, and that includes over 14,000 castles). However, most people don't know how beneficial the app is. When you're commuting on your trip, the last thing you want to do is whip out your laptop to communicate with your host.
By downloading the app, you can easily access any directions your host left you (and manage multiple bookings). For the more spontaneous travelers, use the app to scroll through and find a place to stay within hours. (Sidenote: Airbnb has extended stays too, which means it just got that much easier to live abroad.)