9 Donatello is 4 subway stops from the Duomo, Milan's Cathedral and one of the largest Gothic churches in the world.
Piazza Duomo is the town's main square, on which the Museo del Novecento provides panoramic glimpses. The Monte Napoleone fashion district is nearby.
When walking on a nice day, a stroll to the Duomo from 9 Donatello takes through gardens, historic buildings, a planetarium, and - obviously - exclusive shops.