The Host (Giovanni) was great, he responded quickly and overall I had a good experience with him.
The apartment was great too, it was clean and tidy!
Just one little note, the only, although minor, downside was that the elevator was a bit small and could only hold 3 people max, so we (a group of 5) had to travel back and forth to the fourth floor.
Besides that everything was very good, it was very quiet and just 10 minutes walk to the Vatican. Would totally recommend!