Martina's place is definitely the place to stay in when visiting Milan. Located in one of the most beautiful streets of the city, a walking distance from everywhere you want to see and everything you want to (and should) eat in the city. Martina is a great host - she was always available when I had questions and given great advises about life in Milan.
Staying in this apartment changed all I thought of Milan - there is no other place to stay if you want to experience the city in its best.