We stayed in Gianmatteo and Cinzia's flat for 3 months during the autumn/winter. The flat is lovely: recently refurbished, spacious, and clean - perfect for a couple. There is everything you may need for a stay of any length. The flat is very quiet, with no traffic noise. It is on the fifth floor, and at the moment there is no lift, although one was being built when we left.
The location is very good. It is not right in the centre of the city, but has plenty of shops, bars, restaurants, etc. within walking distance. It is also close to tube, tram, and bus stops, as well as Lambrate rail station (about 10 minutes walk). The neighbourhood is quiet and pleasant, with a mix of students, families, and professionals.
Gianmatteo and Cinzia were very helpful throughout our stay, and promptly fixed any problems we had, while being very respectful of our own space.
We had a lovely time, and would highly recommend this flat to any visitors coming to Milan. Thank you!