This former 19th-century office building, now part of the Hilton chain, is in a superb location, and some guest rooms have floor-to-ceiling windows with extraordinary views of Trafalgar Square and The City. Twenty one rooms are split-level, with upstairs space for chilling out and sleeping space below. Bathrooms have deep tubs, full-size toiletries, and mini-TVs. Go up to the roof garden for spectacular views of the Houses of Parliament, Westminster Abbey, and the London Eye. Better yet, ask for Room 303 to enjoy these exquisite views in privacy.