Me and my girlfriend stayed in Cristina's and Massimo's place for 4 nights. That was such a wonderful time. Every single morning Cristina served us Italian-style breakfast with biscuits, bread and cakes cooked by her own. And yeah, it's served rather early in the morning but even if you went sleep late in the night Massimo will rescue you with super-tasty coffee. They also gave us many tips about the city (not only the touristic part) so we had a chance to enjoy the best of Milan.
Room was very clean. It has its own entrance and bathroom so it feels very private. Internet was fast.
Although the house is not located in the centre it's very easy to get there since it situated close to the metro that goes straight to Duomo and other Milan's most famous sights.
I can't really say any bad word about this place. Highly recommended. We hope to be back there in the future.