Our stay at Maria Antonia's place was wonderful. She was very welcoming and helpful with some tips to plan our visit of the island. The apartment is very nice, big and well equipped. In particular, the view on Valldemossa and the sierra from the terrace is amazing and allows for exceptional breakfasts and aperitives.
Just one comment about the parking spot. It can fit only a very small car (we tried and failed with a rented citroen c3). Anyway, this is definitely not a problem, since you can find free parkings five minutes walking distance from the house.