Sorry for the delay... I'm back online, now
Michelangelo's Moses is in San pietro in vincoli, actually, very close to the coliseum. Moses is impressive, isn't it?
San Clemente is really unique. It was originally build in 4th century and then destroued and rebuild twice, so it is actually a complex of 3 churches one up another, really fascinating.... on the other hand about all the churches you mention are unique one way or another
San Giovanni is quite particular, also. It was build in 4th century by order of Constantinus, but since it was the main church of Rome until San pietro (16th century) almost any Pope did something to improve it. Inside you will find masterpieces for a 1300 years long period....
About restaurant... ok.
There is a small one very close to the "parco dell'appia antica" (Which is where the tomb of Cecilia metella is) The restaurant's name is "la caraffa" The address is "via della caffarella" I'm sorry I don't remember the number. It is a small one, but they cook an Excelent fish and it is also reasonably cheap, 30-35 dollars to fill your stomach near at blasting status...
If you want to eat a very good pizza I will suggest the restaurant "Da Ciro", via della mercede, 43. It is close to fontana di trevi, but it is in a small street. It is the best pizza I've eaten in Rome, so far. If you go there I suggest you to taste the "mozzarella di bufala campana". They don't cook it. they bring it just as it is and belive me: it's really worth while.
If you want traditional Roman food, like Abbacchio, Cacio e pepe, penne all'arrabbiata and so on... go to trastevere. There are many good restaurant, there. One I've been recently is in piazza trilussa. I'm sorry I don't remember it's name, but you can't miss it: it is the only one in the square...
E, naturalmente... Buon appetito :wink: