I had a friend who did a year in the 4 seasons. I think she way paying circa 45k for a (very) small place. That's certainly "5 star feel".
But honestly - with that budget - why not just get a non-serviced place? You can get somewhere really quite nice in Soho or Mid-Levels.
It might also help if you explained what you didn't like about the places you saw as it would give some insight into what you really are looking for.