I had no problems contacting Diego. Every time I asked about anything, he answered clearly and quickly. He even offered us a pick up from the airport. Diego is very friendly and communicative. The apartment, however, is not in Bergamo itself. There is a bus, but it doesn't run on Sundays. It wasn't a big problem because the host offered us help in coming back to apartment. It was a pleasure trip and I recommend Diego as a host :)