Marco's place was slightly out of the centre of Rome, so it's a perfect place if you value peace and quiet. There are plenty of restaurants around, though for some reason, most were closed in the month of August. The bus to the Colosseum is really close to the flat, and from there, you could walk to the rest of the attractions, so it's a relatively convenient place.
The flat is nice, although there are no stoves for you to cook on (just a microwave). One issue we had was that the air conditioner had a tube that needed to be placed outside the window. As such the window could not be closed and this took away the privacy of the bedroom in this ground floor flat.