We stayed here a few weekends ago, and it was a great experience. There are a few things I think the owner could do that would make this place completely incredible.
1. Include the address of the place. The VRBO map took us to the wrong place, and then we got turned around. What should have taken us 20 minutes to arrive lasted over an hour.
2. Continue developing the pond. Sadly, the heat has wiped out the pond, but I think you could expand the pond and make a beach for chairs to sit and fish.
3. Continue developing the land. Get some Adirondack chairs and a firepit for mornings with coffee and evenings with wine. Make more space available for activities, like a little walking trail perhaps
4. Put some fans for the bedrooms. It got warm and the ceiling fans weren't enough.
5. Add more kitchenware.
These things are minor enhancements that can make the place go from really good to outstanding. We had a really good time there and totally would stay there again.