rie wrote:
A friend and I are going to Rome in the easter-week next year and would
very much appreciate to have some advice about where to dine. We will be
staying in the center of Rome and would like both small and cosy with good
traditional Roman food and a superb Italian restaurant to celebrate my
birthsday.

You would be hard pressed to find a bad restaurant anywhere in Italy. While
you are in Rome, just go out walking and you'll find some restaurant that
looks interesting.