We found ourselves in Korat last night, on the way home to Udon Thani from the beach. Didn't want to push the drive back, so we opted to stay in Korat.
The Chaophraya is a pretty basic hotel in quite a good location - just a half block from the little central park that has the Queen Suranadi (sp?) monument. There is a decent shopping mall next door, a Thai restaurant with a huge menu, a small beer garden, and a Japanese restaurant that served decent food. Secure parking is a plus for this part of town.
The room was - well, basic. Worn, indoor-outdoor carpeting, an older air conditioning unit that was quite loud, two double beds with two of the hardest mattresses I have ever slept on. The bathroom was OK - there was hot water, and it was clean. At 500 baht per night, the place was more than adequate.
Staff was very friendly. I would stay again, and would recommend the property to friends who are familiar with barebones inner-city Thai hotels and not looking for much panache or amenities....