The family was travelling to Toronto and we had a flight that had an overnight layover at Heathrow. A friend recommended Yotel and we booked it and stayed there.
It was extremely convenient and there was no trouble in finding it nor paying for it. There was no confusion and we required no help at all. It was pretty much self serve.
We had two rooms, one of us and one for the two teenage boys. There was wi-if access and a restaurant right outside the accommodations.
The rooms are small but great for one night stay, it is made very efficiently just like a room on a ship, so you have fold out beds etc.