Sheena's place is perfectly situated. We swam from right outside the accommodation, as well as further up the road. We brought our bikes with us, and cycled 5 minutes up the road to the town of Schull every evening for dinner.
As for things to do, we took the ferry from Baltimore for a lovely day on Sherkin (bring your bikes, there's hardly any traffic!) and then another ferry from Schull to see the Fastnet lighthouse. Another day we drove to Mizen Head for some lovely walks.
Sheena is full of local knowledge and can give you suggestions on what to do while you're there. If you're staying in, it's a lovely comfortable and calm space to read and relax. We wouldn't hesitate to recommend!