We had a fantastic stay at Cristina's place. It's right in the heart of the Navigli district, but the flat is set back in a courtyard, so it was very quiet and peaceful. It is extremely well-equipped with everything you could possibly need, including window screens to keep out the mosquitoes (which were surprisingly bad in Milan). Communication was always very quick and clear. She was flexible with check-in when we ended up arriving a couple hours early, and she let us store our luggage the day we left because we had a late flight. We would definitely stay again.