It’s definitely worth staying at this place. It’s quite new, located in a really nice area and overall gives the impression of a home from home. The flat has everything you need (just look carefully, if you can’t find something). I particularly liked the glassware - there was some fancy fruit design. Also the espresso and tea cups were made of a really nice material and gave pleasure to drink from.
The walk to Duomo took me about 30 minutes (you can use the tram if you like but it’s about 25 minutes). If you are staying for more than two weeks and will need to use public transport, it’s good to buy a monthly pass (buses, trams, subway unlimited versus 2 euros 90 minutes, the card is 10 euros and the pass 39). To make it, go to Romolo subway station - at St Agostino there is no office. You will need 1 photo and the service is available for tourists.
If you are planning on buying glasses, I can recommend Salmoiraghi & Viganò at Corso Genova, 4. They give 20 percent discounts even for new collections on Fridays and Saturdays. If you happen to be in Milan the first Sunday of the month, you can visit many museums for free. I highly recommend the Armani Silos that is just 7 minute walk from the apartment.
P.S. There was a temporary problem with the neighbours that quite bothered me and I was rather clueless about. Though, it wasn’t Claudia or Luca’s fault, they did their best to solve it, so I have no complaints. They really care about their guests and show genuine interest in their guests’ comfort and satisfaction.
You should definitely choose this apartment and enjoy your trip!