I have experienced quite a few vacation rentals through airbnb, bookings, etc. in North America and Europe. This time around the experience with Marco's apartment is among the best due to the following:
#1 The host is unusually responsive. So far Marco is THE most responsive one among all the hosts I've dealt with.
There were times when I only expected his response the next day because it was very late in the night. To my surprise he replied to me almost immediately.
This responsiveness was quite important for me since it helped me make decisions quickly.
#2 The apartment is spacious and its furnishing is of a great quality
Example:
I've slept a few sofa beds during this travel in Italy. The sofa bed in this apartment is far better than others. It is very comfortable and you feel like sleeping on a standard double bed that has a good mattress.
#3 Great location
It's about a few minutes' walk to the Vatican city. A taxi station is a few steps away. There are many coffee shops and restaurants including a Chinese restaurant (中餐馆），which is good for us.
Note:
The host does not live in the same building. He or someone on his behalf would wait for your arrival to guide you into the apartment and complete the check-in paper work. It would help if you communicate with the host about your expected arrival time.
I didn't know how the check-in process work and didn't update Marco in time about my changed arrival time. Although he didn't complain, I felt very sorry to him and his daughter when I realized she went there to wait for us but we were quite a few hours late.