We had a quick three night visit to Milan with our family (6 total including 4 teenagers). Unit was bright and clean and could not be closer to the Duomo. The three bedrooms were comfortable and worked well for our group. Two rooms had single beds and one had a king. The sitting room and kitchen room were both large and comfortable.
We were there during a bit of a heat wave and the AC system struggled a bit to keep up. Not to big an issue. Maybe a fan or two to move the air to some of the hotter rooms does the trick.
Overall a great stay, top location and clean and comfortable place.