I visited Milan on Boxing Day, (December 26th) for five days.
The apartment is a lot smaller then it looks in the pictures. There was a lot of dust everywhere and there was damp in the bathroom. Also, some broken furniture (bedside table and chair).
The area is VERY noisy. Trains run throughout the day and night. You can hear ambulance sirens every hour. If you are a light sleeper (like myself) this is not the best area to stay in.
The apartment is about a 10 minute walk from the nearest metro station, which you need to use via one connection and then straight into Duomo.
The main area where bars and restaurants are located (Naviglio Grande) is at quite a distance and we had to get taxis there and back.
I liaised with Claudia before my trip and she arranged a taxi to pick us up from Malpensa Airport, which cost 95 Euros. This was slightly cheaper then getting one ourselves. But it is much cheaper to get the Malpensa Express, which we did on our return journey and only cost 12 Euros and drops you off directly to the airport.
Claudia was easy to reach and responded within a good time to our requests.
We arrived after 10pm and she met us and gave us the keys. She also came the day we checked out to get the keys from us. There wasn't a lot of literature in the apartment regarding transport links, so I left my Milan guide book in the apartment for future guests to help them out. The Wifi in the apartment was good and fast to connect to.
If I went back to Milan again, I would book a different place, as I could get something closer to the main bars/ restaurants for less and with more space.