Concierge.com's insider take:

You could never accuse the Four Seasons group of rushing into things. It wasn't until the most prestigious private estate in central Florence came up for sale that they made their move into the city; even then, they spent seven years restoring Renaissance-era Palazzo della Gherardesca, its surrounding 11-acre park (easily the largest within the town walls), and a 16th-century convent before opening for business in June 2008. The result merits a visit even if you're not staying: The courtyard lobby, dominated by lively 15th-century bas-reliefs; the leafy botanical garden, with its yews and sequoias; and the tiny computer room, where guests can surf the net surrounded by 18th-century frescoes, are all worthy of a museum. From the American doorman in, service is impeccable, and the hotel is good with important little details like the freshly squeezed pineapple juice at breakfast. Bonuses include Florence's only genuine hotel spa, with treatments based on products made by the Santa Maria Novella pharmacy; a huge open-air pool; and a restaurant firmly rooted in Italy's seasonal Slow Food movement. The 116 bedrooms, in a bewildering range of categories, are well appointed and come with large marble-lined bathrooms; some guests will feel that the antique decor lacks brio, however. We prefer the rooms in the main palazzo to those in the rather isolated Conventino across the park—though the latter would work perfectly for a wedding party. If central location is a key factor, you may want to look elsewhere: It's a good 20-minute walk from the hotel to the Ponte Vecchio.