After staying in a hotel for 500 nights, I finally understand why you should always book a twin room.

I've always recommended that everyone try to book a twin room when staying at a hotel.
Even if you're staying alone, you should book a twin room.
Couples, don't hesitate—still go for a twin room.
Most people's logic for choosing a room type at a hotel is like this: if one person stays, choose a king bed room.
If two people stay, choose a twin room.