Marco is a superb host. He went above and beyond by carrying my suitcase up two flights of marble stairs, providing fresh fruit for breakfast and snacking, and even printing out my boarding pass. One evening he brought in a bowl of the ripest tomatoes cut up with basil and another with bufala mozzerella, to enable a gourmet personal caprese salad. He provided all sorts of useful information, from where to buy bus tickets (news stands during the day, tobacco shops until 10 at night), to suggestions for places to eat.
The apartment is conveniently located so I was able to walk to all of the sights from the Colosseum to the Vatican, from Trevi fountain to a huge variety of restaurants, pastry shops and wine bars. It is within 2 blocks of the Campo dei Fiori so the nearby open air market attractions and close by restaurants and bakeries are easy to access, but far enough away that the noise could not be heard.
The apartment itself itself stayed cool despite the end of summer heat, and provided all of the desired facilities including working WiFi and a friendly cat. The bedroom was, as described, small, but it includes a double bed and lots of empty shelf space including an area underneath where my suitcase and backpack could be stored.