This apartment is located centrally to everything you would want to access and see in Rome. It's an easy walk to the Vatican, the Pantheon, the Colosseum, etc. In addition, the building and apartment is centuries old and offers a very authentic experience of Rome. Marco was an excellent host and was even kind enough to arrange our transportation to the airport at 4:30AM.
The only con to this apartment is the plumbing in the bathroom as the sink and shower drain slowly and the water pressure is weak. However, this is a small price to pay for everything else that this apartment has to offer.
My number one tip for visiting this part of Rome is to rent a Buzz Car from Buzz4Tours. It's a lot of fun, reasonably priced and way easier to drive around then you would think. The business owner, Peter, is a pleasure to work with.