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booking.com , expedia.com , hrs.com and you can also have a look tripadvisor.com to have more options.
I would like to inform ,we must to use booking .com
BOOKING WITH INTERESTING PRICES
booking.com and tripadvisor
I would say booking.com
It is known all over the world it is easy to use even to someone who are visiting the page for the first time.
If some potentional guests are members of some of the world wide hotel chains, then the best booking site for them will be the official web site of that hotel. They can get more privilleges making the reservation there.