Many travelers certainly are already acquainted with the systems of on-line-reserving of hotels all over the world. The positive sides have these services, such as a quickness, comfort, possibility independently to reserve a hotel in any country. Thus there is not a necessity to ring and walk somewhere. Using these services is advantageous, but it is necessary to know a negative side about which prefer to hold back. Far not all travelers have a time and desire to write the reviews in the Internet.Correct being informed – today the best protecting from surprises.