This restaurant located quite close to the center is really worth a visit. We went there once a day either for lunch or dinner during our 3 day stay in Hoi An. The wording of the dishes in the menu sounds really unspectacular but everything was really good, much better than it sounds on the menu. They have a quite a few regional specialties like white rose, fried wontons and cao lau that are really good but I would recommend just about everything I tried (and I tried alot). The owners are very friendly and are very willing to suggest things and point out the regional specialties.
The prices might be a bit higher than at the cheapo places where locals go but it's worth it especially because it's comfortable and you can sit for a long time (Till 22:00 at least) drinking beer for 3000 dong per glass.