We stayed in Sergio's "Jack London" room for 2 nights while we were in Rome. The room was clean and tidy and had an absolutely stunning view of St.Peter's Basilica from the private balcony.
Sergio was a fantastic host. We didn't get to meet him, but his short video describing how to enter the apartment was perfect and he was always available via text to answer our questions.
We left Rome for Sicily for 6 days and when we returned, Sergio went above and beyond to book our return trip from the airport despite the fact we weren't even staying with him the second time.
I would recommend staying with Sergio not only because he's a fantastic host but also because his apartment is beautiful.
Just a note: a little outside the main attractions, but we still walked everywhere so that was not an issue for us. The bathroom pipes make a loud noise after you flush the toilet, likely due to the age of the building, so just be aware if using the washroom frequently in the middle of the night.