My last night in London I ended up in a single room. Single rooms in London are very different from single rooms in North America. By single, they do mean a single/twin bed not a lone queen bed in the room. Also, the room size is significantly diminished. I'll show you what I mean!
Here is the view when you first step into the room:

Standing in the doorway, looking toward the bathroom:

The Jetson's bathroom?


Just outside the bathroom door - the desk, the door out, and a wardrobe.

No wasted space here! ;)