If you've never been to Europe, you may not realize that:

1. Often the rooms are really tiny (smaller even than the rooms you thought were tiny in Manhattan NYC).

2. Beds are tiny too. A "double" bed is not king bed, not a queen bed, at best a "full size" bed (but don't count on even quite that!). So-called "double" beds may sometimes be nothing more than two narrow single beds pushed together so they're side by side! They definitely can't accommodate three people if you're not sleeping on top of one another.

3. Hotels often charge per person, not just per room, and so you may be hit with a charge when they discover that there's an extra person in the room.

4. Local fire codes may be different, and it's possible in some places it may be downright illegal to have more people in the room than the website says.