Concierge.com's insider take:

Location, location, location. Glamour, glamour, glamour. At the Pest end of the Chain Bridge, this is the 2004, 179-room Canadian contribution to the ever-posher former home of goulash communism. A 1906 Art Nouveau landmark was co-opted into service, its lobby made melodramatic by tens of thousands of mosaic tiles laid in a Frank Lloyd Wright design, and a vast, glittering glass cupola with a chandelier suspended beneath like a giant, exploded crystal artichoke heart. Rooms are generously sized (the smallest is 350 square feet) and plush in their subfusc palette and deep-pile carpets, with king beds and deep tubs in the marble bathrooms. Seeing you're already paying the city's highest rates, you might as well go all out and insist on a Danube room, maybe even one with a balcony; the Pest-view rooms are fine, but a courtyard view could be disappointing. All guests get to use the top-floor spa and gym, plus the infinity-edged indoor pool with underwater music. As usual with Four Seasons, kids are well catered for—and you can house your under-18s in your room gratis. Even if you're not staying here, stop by the cocktail lounge and soak up the grandeur.