You can overlook the roofs of milano from the two balconies and especially the view on the nearby Basilica is beautiful. There also lives a tortoise on the bigger balcony. It is friendly and likes it if you rub its shell with the back of your hands.
The apartment is centrally located. The Subway station is just 2 minutes away and several small supermarkets, restaurants and cafes are close by. I recommend the Pizzeria Rossini. You can also easily walk to the Duomo or the Castle in under 30 minutes. There is also a park nearby where people walk their dogs.
As others mentioned, the apartment itself is pretty old. Some of the curtains have holes, the mattresses have seen better days and I would recommend bringing beach slippers for the bathtubs/showers. But the apartment also unmistakably italian and gives you that experience, if you are looking for it.
The apartment is accessed via a small elevator (6th floor). Heavier people or people with claustrophobia might have some problems. I just had to tug in my shoulders a bit.
The Wifi is provided via a mobile access point in the apartment. There were some problems with it, but those were promptly fixed the next day.
The owner is polite, answered to questions quickly and was very accomodating regarding check-in/check-out times. The price was fair in my opinion.