Carlo is a great host; very friendly and responsive. He let us check in early and organized a taxi for our last day when we had to be at the airport before 5am :)
The flat is clean, well equipped with things you need in the bathroom or kitchen. There were other people staying in the other rooms but we didn't hear them much because they were quiet. We did however hear some noise from the bathroom because our room was adjacent to it. It's not a big deal for us because we were tired and we slept anyway, but if you're sensitive to noise, you might want to avoid this particular room.
Other than that, the room was very nice, comfortable and clean, and so was the whole flat. Would recommend staying here.