I do not have negative feelings about the host and I hope that what happened to us was just a coincidence and the host will offer better service in future. :)
Positive: 1. Good location and price.
2. He gave us an old umbrella for free to walk in the rain.
3. He told us how to get to Duomo.
Negative: 1. We have said that will arrive at about lunchtime, we arrived actually at 11.30 at the address but there was nobody to meet us or answer the intercom. We called the phone number that was stated on reservation multiple times but nobody answered. Then I roamed through the whole building trying to find the apartment but there was no sign to show the apartment door. We went to a nearby pizza place and left our bags in a restaurant wondering what to do. Finally, the host called us :).
2. When showing us the apartment the lamp of bathroom burned and the host promised us to replace it - I offered him help. We could not take a shower because when we came back in the evening there was no light in the bathroom and It was quite cold in the bedroom. I had to find a solution to use this bathroom - I put the night lamp from the bedroom in the bathroom and this partially solved our problem.
Concerning heating - it seems that the heating was turned off when the host was not home. When he returned in the night it started.
Best wishes!