We can surely recommend Serena's apartment. Location was good, next to Naviglio (great for shopping, strolling around and having a drink) en a 20 minute walk from the Duomo.
We were with five girls and had a great weekend. The apartment had enough space to cook or have a drink - next to sleeping.
Communication with Serena was good. Her English is excellent and she was very friendly. Bought breakfast, gave good instructions to the house and a great tip for a restaurant near the apartment.