We used to go to that Thai place when we lived up there; great spot. My sis and BIL lived in Parkfairfax when they were first married and they went there all the time. There was a Thai place closer to our house in Westover - next to the original "Lost Dog" - that we went to quite a bit as it was excellent. The best Thai place in the area IMO is a place in Bailey's Crossroads called Rabieng. (One caveat is we moved away seven years ago, so no idea if it is still great.) Very small and usually pretty crowded, but you live close enough that take out would still be hot when you got home.