We had a wonderful week at the Barn for Carnival. It's a big, clean, spacious and practical place. We grilled several times, had meals on the patio, and had our coffee in Suzanne's Garden, which feels like your yard, though it's a public garden. (The garden is absolutely beautiful, and not heavily visited, which was nice). The owners were very attentive and helpful, providing plenty of towels, sheets, and free laundry in the basement (great perk!). The beach is right there. We rented a kayak for the week and the friendly neighbors showed us where to dock it so we didn't have to bring it back up to the house. The space is close enough to MacMillan Wharf to feel connected to PTown activities (the carnival parade went right by us on Commercial Street), but far enough away to be a peaceful escape.
It's a perfect place for a small group of people. We had five and were very comfortable, even with the single restroom.