Our stay with Roberto, his brother Fabrizio, and their staff Dana was wonderful. Their transfer service from the airport was well worth it, and we ended up getting a tour from Fabrizio in the process.
The apartment is on the top level of a failmily property with a beautiful private terrace, and they treat you like family throughout your stay. The property is a bit removed from the core tourist areas, which makes it quiet, although a bit of a walk from all the sites (closest is the Colosseum at a 10 min walk). Public transit with the metro, bus, and tram are all also within 2 mon walk.
They have a partnership with local tour groups, giving you a discount on skip the line tours, so book through them. They also provide many recmmendations for other sites to see and places to eat.
If you want a full service stay sightly outside of the main tourist spots, but close enough to walk, this place is for you!