Heading there for the bones of a week.
I want tips, tricks, insider information, what to see, what not to see, where to eat, where to get good beer.
Get on it.
Try to walk as often as possible because on your way to places you'll see streets that are amazing and seem to be bursting with history. Bring a large empty plastic bottle to fill from public water taps. The water is perfectly safe to drink and if you buy it from kioscs you'll get fleeced. I remember that a small bottle of water was more expensive than a large can of Heineken in a kiosc outside the Coloseum.
As for eating, go to Tratoria's rather than Ristorantes which tend to be very expensive. Lots of places do a tourist menu which includes two courses(first one usually spaghetti) and a small garaffe of wine. Usual trick is to see where the locals go. It can save you a fortune.
Have a good trip.