Olotels.com

Above and Beyond Satisfactory.

They offer an extensive choice of hotels in every destination, they provide a decent amount of information on each of these and always have the best price.
When you include the rewards scheme it makes them really stand out from the crowd, they go from being a booking option to the only site you'll consider.
Theres nothing else to say, I discovered this site when I was in a rush and a panic to get a place to stay sorted and they really came through for me. I will remain a customer for a long time.