The problem with 15th-century villas would be the 15th-century plumbing. And the 15th-century water, and maybe even some of the 15th-century eating habits, depending on your taste.
Fortunately, the only thing that’s 15th-century about Il Salviatino is the building, and maybe a few pieces of art. A painstakingly restored villa-turned-boutique-hotel set on sprawling grounds overlooking Florence’s scenic rooftops, Il Salviatino is thoroughly modern where it counts: in the quality of its beds and bathrooms, and in its sense of luxury, which has a staff of ambassadors who are available at your beck and call 24 hours a day. Its artwork spans several hundred years—the 19th-century fresco, located in the Affresco Suite, deserves to be in a museum—and the oversized leather chesterfields and carved wooden chairs and bookshelves seem to have been lifted from private libraries and clubs over the last 150 years. As for the cuisine, both your Italian nonna and a Michelin-starred chef would gush over the hotel’s farm-to-table Tuscan cooking.