My wife and I stayed one night at Mirbeau. We also had a couples treatment called "It Takes Two". Everything was very relaxing, we enjoyed our time there. The staff was very friendly and we would recommend it to our friends.
We only ate breakfast there, but it was fantastic, I had the French Toast and my wife had the Eggs Benedict. Best we have ever had. Super friendly service also.
I did read some other reviews before we went that were pretty negative so I was a little worried. But I can say our time there was very good without any problems. The facility may not be perfect and shows signs of some wear, but nothing that affected us having a very relaxing, comfortable stay. We did not go there to do an inspection of their Hotel/Spa/Restaurant, we went to have a good time and relax. Which we did.
In fact my wife accidentally left her ipad in the hotel room. And we got a phone call from Mirbeau on out drive home, so we turned around and went back to pick it up. I think this says something about the high quality of people they have working there. This might not have happened at another hotel.