Heaven is definitely recommended for a look.Best between 4pm and 8pm.It was recently mentioned favourably on another thread by Cupidman.Very attractive rooftop amenities.Handy to many Silom Hotels.
Their web page is in French so I guess the ownership is also but Heaven is popular with working locals.Used to have masseurs on hand but not sure if that is still the case.
http://www.heaven-eden.com/