My extended family and I stayed here for a week in June 2015. Our time there was nothing short of amazing! Everything, and I mean everything, was perfect. The staff, the landscaping, the house, the decor, the pools, the plentiful sitting areas, the paddle boards and kayak, the views, the beach (which we had to ourselves all week), the ocean...all perfect. Staying here truly felt like luxury! It was relaxation and leisure at its finest. A major highlight of the trip (that I recommend 100%), was having our dinners prepared by three wonderful local women (this can be arranged through the property manager). These women knew their way around the kitchen and cooked every meal from scratch using extra fresh, local ingredients. We had guacamole, pico de gallo, a salad every night. Some other meals included fried fish, rice, re-fried beans, fajitas, shrimp quesadillas, chili rellenos, shrimp diablo, chocolate flan, and two different types of tres leches cake. It was definitely a treat and worth every penny.
As for La Ventana itself, as cute a little town as it is, there's not much to it. It's still worth checking out to get a feel for the local scene. La Paz, BCS's captial, is a short, scenic 45 minutes away and is a must do. We did a snorkeling excursion through a company called Espiritu y Baja that was absolutely fantastic. We got a wonderful and very informational tour of the Sea of Cortez, snorkeled with sea lions, saw dolphins, and ate homemade ceviche on a private beach. This is a must do!!
I really don't have one negative thing to say about Casa Duna and its surroundings. If you're on the fence about vacationing here, just do yourself a favor and go for it. You won't regret it for a second!