if you are looking for a Kosher food in Rome please check out CHAGAT 66th
to BOOK Shabbat food please firstname.lastname@example.org
He collaborates with Kosher Cesar Palace Rome.
I strongly suggest this place for 3 reasones:
1) Location: The Jewish Ghetto
2) The food : high quality Fast food and also full meals
3) The price is very convenient
Having said that they have a website which will allow you to book easily:
p.s. they have a SPECIAL SHABBAT KIT service.