My advice is to use the Rome Pass. I forget the price - 20 or 24 euro's?? You get free admission to the first two sites and then a discount on all other applicable sites. You also get 3 free days of metro and bus use. Metro station is 2 blocks away and will easily get you to the Vatican, Colloseum, Spanish steps, etc.
There are some great restaurants nearby. Easy walk to Trevi, Forum.
