Piera's flat is simply amazing - it's very tidy, close to the metro station and there is everything you could need (Piera even gave us a bottle of water to the fridge).
We stayed there in summer, but there is air conditioning and blackout windows so we slept really well.
The location is very calm, there is a little balcony where you can have a breakfast or just coffee from Italian moka (the coffee is included) and it's situated to the yard.
Piera herself is really kind and helpful woman. She gave us many advices and also showed us everything necessary in the flat. The communication was clear and she answered fast to our messages.
I'd definitely recommend this flat for staying in Milan - I'd choose it myself again :)
10/10