We stayed some days in Sergio's flat and so far this was my best airbnb experience. Before arriving Sergio sent all the information to arrive at his flat. His home is very clean and he is a very kind guy. He prepared every morning our breakfast even when we left at 6 in the morning. He gave us useful places to visit.
His flat is in a safe district, in 15 minutes walk you can reach the tram to get into the center.
During the night it is better not to sleep with the open window because the road is very noisy.