The Restaurant at 275 East St. on Ludlow's main drag is an easy place to like. Perhaps it's the word "cafe" in the name - it's similar to the kind of small spot you wander into in a strange city, where everyone seems to know each other, the food is good and the portions are ample. My friend Jeff talks about the "tingle" he gets from walking by a good restaurant. Primavera gives you that kind of tingle. It's modest and unpretentious, seating around 50, with a small bar and par