I'm confident to say that Aria is one of the best services for short & long term rents in Milan. With Aria I saw with my eyes that the accomodations were sanitized and clean before AND after arrival (really important nowdays with the global COVID situation). If you want to be extra sure to live in a comfortable and clean place you need to consider ARIA apartments (you can check it by yourself, as soon as you enter the flat you will smell cleaness and hardly find some dust on forniture). The studio flat I stayed was big enough to do my stuff including home working. Every flat seems to have all the necessary to feel like at home (dinnerware, washing machine, iron, HUGE tv). I stayed for 3 nights but I can tell you, I would have to stay there longer lol the flats of course are on a (real) luxury level and yet still affordable. The position of the flats was quite central and if it's the first time you are in Milan you can trust and confide in Omri which is the perfect host - kind and helpful.