My workplace is just a few hundred meters away. I come here frequently both with family, friends and in a work-capacity. While the restaurant proper (upstairs) is for special occasions, the enoteca (downstairs) is more informal and suitable for dining any day. The atmosphere is relaxed, food excellent (from the same kitchen as the more pricey restaurant upstairs) and the waiters normally knowledgeable. They also know their way around the substantial wine-list.
The trattoria in the church courtyard is a good choice for lunch on a sunny day, especially if you can find a table in the shade of one of the trees. The service is normally slow, don't go if you're in a hurry!