I would 100% recommend staying with Dolors at Castell Barderas!
A rental car is definitely the best way to visit. The village is very small and quiet but in a good location with Girona, the coast and many interesting towns within a 30 minute drive.
The accommodation is spacious, clean and comfortable. Dolors is a very welcoming host and provides everything you need, the breakfast was plentiful and tasty - fresh bread from the bakery.
Also highly recommended to receive a massage as Dolors is a very talented and professional masseuse.
Overall, we had a great stay and it was indeed very relaxing!