Reading the great reports on Chao Praya thought would give it a try.
Rang and texted ahead for a 12:30 slot. Arrived pressed the intercom only to be told fully booked. I asked when anyone free and told to come back at night.
Not a great or polite response. Went to Kama instead where always guaranteed great time and good service.
Probably wouldn't bother trying Chao Praya again.