Chiara's apartment is very easy to find, it's just a 10 minute walk from Milan Centrale. We were checked in quickly and had no problems at all familiarising ourselves with it. The apartment is furnished with everything you need for a short stay (we were 5 nights) but would be perfect for a longer stay too. It was lovely to stay somewhere with real character - this applies to the building itself too.
The neighbourhood has everything you need: bars, restaurants and grocery stores are all on your doorstep. There is a Metro station at the end of the street which can take you to Piazzo Duomo in a few minutes. Being so close to Centrale is also handy if you want to take the train up to the Lakes for the day.
We had a great stay in Chiara's apartment and she was a very helpful host.