I've dined at Chef Hannes a number of times and the service and quality of food never ceases to amaze me! I most recently had the seafood spaghetti diablo (a special) and it was fantastic! My recommendation is to bring a bottle of your favority wine (corkage is very cheap, and I think they have free corkage on Mondays and Tuesday), and enjoy a wonderful meal. The entrees are very reasonably priced, and for the quality - excellent value. I wouldn't say the ambience is great, but it's a tiny, cozy restaurant and perfect for a week night date. While walking down Main street it's easy to miss this tiny restaurant, but it might be El Segundo's best kept secret!
Pros: Reasonable prices, Friendly Service, Plenty of parking
Cons: Few tables, Plain ambience