Nicola is very welcoming and even offered to pick us up from the train station (but we like to walk to see the area so we met him at the house). The apartment is on the second floor of a two storey house, Nicola lives in the apartment next door.
The apartment is spacious and nicely decorated. Everything is new. When we stayed there the gas and internet were not connected yet but we stayed most of the day at the Milan Expo so it was not an issue.
The train line passes in front of the house so it may disturb light sleepers but we had no problem sleeping.
The apartment is a good base for the expo but there are not restaurants and shops in the area. The station is a 20 to 30 minute walk but I think there are buses that go there. The expo is in the next train station. The city is a bit further away but also easy to reach by public transport.
We highly recommend Nicola and his apartment. May be easier for people with cars but if you don't mind walking it is a good place to stay to visit the Milan expo.