We spent 5 days in Marco's flat and everything was fine!
The appartment is nice, clean and well renovated, with everything you need to have a nice stay. The flat is a bit noisy (you can hear people surrounding flats in the night) but it was not a problem for us.
It is very well located in Navigli, with many places to eat and drink for "aperitivo".
Real pluses are Marco's garage where you can park your car for free and air-conditionning in the appartment.

Marco is an excellent host. He was very flexible for scheduling check-in and check-out and he gave us a "short-list" of his best places to go out in Milano. During our stay, we had a problem with the boiler and Marco quickly reacted to solve the issue: many thanks!!!

In conclusion, we warmly recommend Marco's place