Mary's Brooklyn Studio was great, and Mary a great host. The apartment itself is easy to find and looks exactly as advertised. The space is clean, and surprisingly bright and spacious. It's also very well stocked for longer stays. It's 5 minutes from Prospect Park, several restaurants and bars, and 2 or 3 blocks from subway stations and bus stops.
Mary was very responsive to messages, and the guide she provided for the neighborhood was amazing- Several of my trip's highlights came out of it. Check in and check out were an absolute breeze. Couldn't ask for anything better, and I would recommend it to anyone looking to stay in Park Slope; I'll certainly check in if I make a return trip.