Some of the earlier reviews on The Sphinx seem a bit harsh. It doesn't advertise itself as 5 Star, nor should it be judged against the upmarket chains.
The Sphinx offers clean, basic accommodation. You kind of get an early feeling from the positioning of a hotel in Geelong that is constructed around a replica of one of the Wonders of the Ancient World that this place is not going to be something from an architectural catalogue.
So, expect basic, clean accommodation. Also expect fittings that would not have been out of place in a yard sale run by The Brady Bunch thirty years ago. Everything works, but a trip to the homeware megabarn for some new furniture every decade or so would be in order.