Looking for an affordable and sustainable way to travel around Europe? Look no further than the a&o Hostels app. With 39 hostels in 23 cities, a&o is the world's largest hostel chain, offering beds starting at just €12 a night.

Not only can you easily search and filter through their portfolio of hostels, but you can also book, check in, and even unlock your room door all through the app. Plus, with high-speed WiFi available at all locations, staying connected has never been easier.

a&o Hostels is not just affordable, but also sustainable. They already produce 66% less CO2 than other budget hotels and purchase 100% green electricity from renewable sources. Additionally, they prioritize healthy food options and offer play corners, bottle warmers, and strollers for families with young children.

Overall, the a&o Hostels app is a proven and trustworthy option for travelers of all kinds. With real reviews from over 10 million guests and features in the New York Times, you can trust that you're in good hands with a&o. Download the app for free today and start your European adventure!