Came here last night with a friend. I was drawn to the simple and intimate terrasse- I love the ambiance! However you will have to wait a long time to be seated outside if you don't have a reservation. We placed our name on the waiting list and had to wait 30 mins (and also saw our table given away to people who had arrived after us, grr!).
We ordered the salmon tartar spring roll as as an appetizer - I didn't love it, it had a perfume-y aftertaste. We ordered the pork and shrimp pad Thai as an entree and it was a winner! Super tasty and a good portion size - but not for people who don't like spicy food. If you want to eat well but not break the bank I would definitely suggest getting the pad Thai.
I would recommend Ha for a nice warm evening on the terrasse....with a reservation.