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I was thinking of Arun Residence, which has been reviewed a number of times here. But it sounds like there are some other places with similar names. If you search on Arun Residence you'll get a number of reviews here.
The aurum is a small "boutique" hotel on the river but its web site takes forever to come up. I will keep looking for references to it elsewhere. thanks again
I just did a search here on Fodors on Aurum and found a post about boutiique Bangkok hotels. At the very end Scotters make as comment about it and gives a website that (for me) pops up immediately.