There are small toilet rolls sold special for Hotels, this tells me two things, one their clients seldom stay long, and people steal the rolls.
A great Backpacker hotel or hostel is when they Hotel needs to ask people to leave because they are too full. Although if you need a reservation, this also is a horrible backpacker hotel, because your trip is controlled by reservations.
One sure sign the hotel is maybe more of a love hotel, and not many people are staying long-term is the size of the rolls of toilet paper.
It may also tell you about the other clients, often the residents steal the paper and the hotel just wants to limit cost.
What does an extra small roll tell you?