This is not a good apartment and I'm very surprised it had a 4 star rating by time I booked it. Overall it doesn't feel very sanitary, but the bathroom, and specially the shower, hasn't seen a thorough clean in quite some time. The bed sits on top of an old door that once gave access to the building's hallway so you hear everything going on the building during the night. The building it self is not in great shape either and there were several noises during the night which made it really hard to get a good night's sleep.
The location is near the station but it's in a sketchy neighbourhood. The apartment is very cramped. It has way too many things for its size, it's not functional and it's outdated.
Andrea, the host, is just about the only positive thing about this stay. He's was very responsive, flexible and helpful, as was his assistant Edoardo.
If you're looking to stay in Milan just for one night this kinda might work, as it is sort of affordable and close to the station. But I wouldn't expect to have a restful and comfortable evening.