This hotel has left Accor and rebranded as a Hilton Garden Inn.
I have (had) a booking for February and just received the following mail, on December 27th (i.e. announced on the same day it happened):
thanks for the info
stayed there once; Accor has plenty of better properties in Bangkok to choose from
good location though for those, who like to commute on the river. Accor has now nothing left close to the river except an Ibis....