We enjoyed staying Marco's place a lot. Location is absolutely fantastic, little quiet street, near park, COOP supermarket 5 min walk, Colloseum 10 min walk. 20 min walk from Termini station. We could not imagine better. We could walk from there everywhere. Nothing is too far, even walk from there to Vatican took just over 30 min.
Appartment itself is small, but just right for a short stay. It has everything you need, including kitchen, bathroom, internet, little table with 2 chairs. It has a nice atmosphere. Only watchout is that the main entrance is just next the door and neighbors sometimes shut the door noisily.
We can only recommend this appartment.