We had a great stay in Marco's apartment. It was quite small and basic but perfectly adequate and had everything you would need for a stay in Milan. We stayed for one week and it was great value for money.
It is about a 10 minute walk to the start of the Navigli area and about 25 minutes to the busy area of the canals. Public transport is good but there is no metro in the immediate vicinity. There is a good supermarket 5 minutes away and some cafes and restaurants close by.
Marco was very helpful and responded quickly to any queries.