apartment is great! there are a lot of small details that help tourist, things i always looking for in an airbnb and this apartment has it all!
for e.g. there's a weighing machine to check your bag weight - great for those trying to buy stuff in milan and flying back. there's plenty of toilet roll too, so you don't have to go buy your own. the portable aircon works great in the summer heat.
it's possible for long stay too, there's a extendable table if you need more table space for kitchen/work and etc.
supermarket is right outside the apartment complex (5 mins from apartment to supermarket). so it's great for long stay too. the kitchen can be a little small but as mentioned, there's a extendable table in the bedroom which can be used for food prep, so it's not an issue.
also this is the first apartment in italy i came across that has separate dustbin... most of the apartment i been to in italy had just one rubbish bin and expect you to sort the trash...
didn't get any mosquito in the summer evening too when the window is left open
the metro is easy to access too, about 10 to 15 mins walk and you are there. just 4 stop to the central train station and 7 or 8 stop to duomo. honestly, just use the metro in milan, it's fast and cheap. get the 1 or 3 day metro pass (7 euro or 14 euro) and you can save the money for other stuff
Piera also gave a good run down on things to see around milan and is very detailed on all the little aspect of the apartment