We stayed for two weeks while I was on sabbatical (and my partner worked remotely). It's an incredible location. Waking up to the panoramic views every day is amazing. It's a huge place (at least for someone living in London!) and the kitchen is really well equipped. Worth being aware that it's off-grid, but it was fine for my partner to work remotely (ie with full days of video calls).
We went for a swim most mornings at Miller's Point tidal pond. It's also really close to Cape Point national park and the Scone Shack (definitely go there if you're staying).