Try Locanda Veneta on 3rd Street off La Cienega. Romantic and never rushed. We've eaten there a few times and we were never pressured to leave. The last time we went I thought the food was a little salty but it was still good.
Petit Jaques just east of Dixie Cyn on S side of Ventura; Bistro Garden, west of Coldwater on the S side of Ventura. La Frite does have a place in Sherman Oaks, on Ventura, just w of Lemmona, but I don't think it's romantic.