I stayed at the Mariposa Inn in late Aug, 2009 -- the room was lovely, with a little sitting area with flat-screen TV, small refrigerator, and microwave, and a bedroom with another flat-screen TV above a fireplace. My room faced the pool, but I had no noise problems, either from outside or from guests in the adjoining rooms.
The hotel is convenient to downtown, and literally right by the entrance to Hwy 1 that goes to Carmel -- less than ten minutes away. A great location.
I would definitely stay at the Mariposa again.