Checkin was very easy - Sergio and Daniela were easy to commute with, and Maria waited for me with the keys and showed me where everything was. There's an elevator to the 4th floor and then a short flight of steps to the 5th where the apartment is.
Location is wonderful, it's right in the center of Milan and a Metro station is right in front of the building. The apartment is cozy, very clean, and has all the amenities listed.
I highly recommend Sergio and Daniela's place.