We stayed at Ten Face Hotel. This boutique hotel only has suites and at $6000 Baht ($258) per room night for a two bedroom suite which accomodated four of us, that worked out to only S$64.50 per person per night.
It has two bedrooms, a living room, a dining room, a kitchen and even washing machine to do our laundry.
The suite was huge, I think it was equivalent to a four room HDB flat. It was a very comfortable stay for us and the location wise was also quite central, it was situated three BTS stops away from Siam Paragon.
A nice boutique hotel which is worth a try.