Visited on early Tuesday evening when we were only people in restaurant ( and we’d booked! ). Really tasty food. Not pretentious place, just decorated with Thai memorabilia and simple tables/chairs, although chairs do get a bit uncomfortable after a while.
Asked about GF food and no issues as owner and staff well aware of what it is and what you can have.
Easy to recommend and as earlier review says, it makes you want to book a holiday so you can enjoy the food in Thailand. If that’s out of the question, then Thai Sabai is a good second.