2028 Chestnut Street, between 20th & 21st.
Awesome. Not the typical "Thai restaurant" decor: very bright and airy, with underwater scenes painted on all the walls. The service was excellent -- very attentive. The food was great as well.
The lunch deal is the best. $7.95/$8.95 for 3 courses (eat in only). A soup, an app and a main course. Can't beat it. A la carte prices look very reasonable, both at lunch and at dinner. I had Tom Yum Soup, twi Shrimp & Corn Cakes, and Pad Se Ew, accomanied by green tea. My lunch partner had something called Ravioli Soup ("Home made shrimp & chichen dumpling"), a Spring Roll and Masaman [sic] Curry. The bill, including tax, was $20.