I just wanted to record that, when we stayed, my wife found the street noise too much to be able to sleep and so on the second night we were moved from the 6th to the 12th floor where she then had a perfect night's sleep.
When I raised the fact that they guarantee a good night's sleep or your money back they refunded the cost of the first night without a moment's hesitation.
Good for them. I'll certainly use them again.