Mario was very welcoming. He was waiting for us in the flat and his app for walking itineraries is perfect especially if you don't have much time. When we got in contact he always replied promptly to help us.
The flat is bright, with a nice view over the roofs, spacious and comfortable. The locations is perfect for sightseeing, it's just 5 min from the main train station and the metro from the airport. The area is great, full of lovely shops, bars and restaurants yet very quiet at night.