Small hotel but large room and very clean bathroom. If you're looking for a low-cost hotel but with a nice room and lots of meal hawkers around it, then Atelier Suites is a perfect choice. Stayed 3 nights there with my daughter and was quite happy with the experience. The only downside is that the hotel is far from city centers (where the shopping centers are) and no hot kettle in the room, so we need to go down to the lobby to make hot tea or cup noodles:).
Near Rajamangala Stadium, to avoid the hassle after the concert you can take a walk instead of ending up waiting for the driver to accept the ride. The room is quite spacious, great shower, maybe a little work with the room lighting would be better.