One bonus of booking with Topdeck is that it does not charge a single supplement. Instead, the company will match you up with a roommate of the same gender at no extra cost. This can lead to massive savings over traditional companies that charge the supplement. For those looking to get a taste of Europe in a short amount of time, Topdeck’s most popular tour, Mega European, covers 20 countries in 49 days. From the old capitals of Western Europe to the emerging Balkans, this is a fantastic overview of the continent.