Perfect place for a city break! Went in january when the crowds were down, which worked out great for us. Didn't have a single bad meal, but if you want to save some money, head into any of the piazza's and find a small butcher..pick up a bottle of wine, fresh cheeses, meats, olives, bread etc. We did this on our last night and wish we would have done it every night! All of teh above mentioned fed 3 people with plenty of leftovers and cost less than a 10er!
We did encounter quite a line at the colosseum but luckily we purchased the ROMA pass, which allowed us to jump the line and get right in. During low tourist season, the line we would have waited in was 2 hours if we didn't have the pass. We didn't use it on anything else (sadly) but was well worth it for the one time!
Also, the red top bus tours are great here. They stop at all the hot spots and plenty of food and drink along the way.