Compared to Vedge or Sprig and Vine neither
Mi Lah Vegetarian nor
New Harmony Vegetarian Restaurant are especially "romantic" but I have never been disappointed with the food at either place.
New Harmony Vegetarian Restaurant
135 N 9th St.
Philadelphia, PA 19107
(215) 627-4520
http://newharmonyvegetarian.com/Mi Lah Vegetarian
218 S 16th St.
Philadelphia, PA 19102
(215) 732-8888
http://www.milahvegetarian.com/If those two places are too expensive... Maybe
Blackbird Pizzeria?
Blackbird Pizzeria
507 S 6th St.
Philadelphia, PA 19147
(215) 625-6660
http://www.blackbirdpizzeria.com/