I used to love the Corinthia (or, as I used to know it - the Royal), but cannot recommend it now without reservations. The breakfast and front desk staff is excellent, as is the breakfast. Lots of good choices and friendly and helpful staff, no complaint there.
The room service, however is hit and miss. Some of the towels are frayed, as are the bath robes, important, since one uses these to go the Spa. In one occasion (out of 7 days) our room was not made up until we called the front desk at 4 PM, even though we put a "Please make up our room" sign out at 10 AM. And the state of the facilities was not very good: Our wash basin drained extremely slowly, was clearly clogged, but wasn't fixed. The bathroom (we had a "superior room") had no hand shower, only an overhead one, clearly outdated, and the shower leaked on the side, inundating the area of the water closet
The Corinthia needs a careful renovation with modern facilities and an improvement in the room services to earn its stars again.