The location is unbeatable - directly at the main canal in Navigli with all its bars and restaurants. Even though it is located in a very crowded area it was super quiet at night (apartment is in the backyard). I have to deduct points for the equipment of the apartment - not even two glasses in the kitchenette and bed was not super comfortable (it was okay though for our 3 nights stay). Apartment was fairly clean, but clearly the stairs weren't (I didn't mind though since the bathroom was clean). Also a little minus for us: only one bed cover. But all in all: if you're looking for a fairly cheap stay in Milano in the surroundings of Navigli - this is our choice.
P. S. Read booking instructions carefully since you have to pick up the apartment keys at the Milano Central station.