179 -- London: 'majestic' 5-star hotel by th e Thames

This £179 bed-and-breakfast offer from The Royal Horseguards hits all the right notes: a luxurious 5-star hotel described as "majestic" by The AA and housed in a 19th-century Grade I-listed building; a perfect location overlooking the Thames and within walking distance of Big Ben, Covent Garden, and Trafalgar Square; and a price we don't often see for hotels of this standard.