I have stayed a few times now and always found the room except on one occasion to have a musky / damp dog smell about it.
The other thing I dislike is the bed, too hard for me and always ended up with a aching back.
When I did have breakfast there I thought it was very good, but then again I kept it simple and never looked for anything other than bacon, sausage, eggs and yoghurt.
I have been staying at the Four Points in Soi 15 more now and always check pricing against the Westin as sometimes it is not all that much more.