I have stayed at La Posada de Piedra and think it is a great place, we loved it...but it is by no means a hotel, not for a business traveller anyways. It is a very simple "cama y desayuno" aka B & B! As long as you are realistic with your expectations, you should be ok!
Also, they dont have A/C in the rooms so the ocean breeze will have to cool the room.
Good luck.